Random Desktop Crashes

I have a weird problem that keeps happening - occasionally, while using Zorin, my monitor will flash to black for a second or two, before returning to the login screen. No code, no error message, just an immediate black screen, then login. When I log back in, all my programs have been closed.

I don't know if the computer is crashing, or if something else is happening, but the event is starting to get annoying. The use of LibreOffice and/or Evince Document Viewer seems to be related, especially when I have a browser open. Does anyone have an idea of what's going on?

You may have logs in /var/crash/

Thanks!

I can't see if any logs are from the day of the event, so I'm going to attempt to replicate the issue, then post the logs here.

Sorry for the delay! I succeeded in replicating the event, and have the event logs below (apologies for the wall of text):

16:51:49 systemd: Started Application launched by gnome-shell.
16:51:49 packagekitd: uid 1000 obtained auth for org.freedesktop.packagekit.system-sources-refresh
16:51:49 fwupd: 23:51:49:0033 FuEngine failed to record HSI attributes: failed to get historical attr: json-glib version too old
16:51:49 systemd: Started Firmware update daemon.
16:51:49 dbus-daemon: [system] Successfully activated service 'org.freedesktop.fwupd'
16:51:48 fwupd: 23:51:48:0872 FuPluginTpm failed to load eventlog: Failed to open file "/sys/kernel/security/tpm0/binary_bios_measurements": No such file or directory
16:51:48 systemd: Starting Firmware update daemon...
16:51:48 dbus-daemon: [system] Activating via systemd: service name='org.freedesktop.fwupd' unit='fwupd.service' requested by ':1.216' (uid=1000 pid=9244 comm="/usr/bin/gnome-software --gapplication-service " label="unconfined")
16:51:48 gnome-software: disabled plugins: dpkg, dummy, repos
16:51:46 systemd: Started Application launched by gnome-session-binary.
16:51:41 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.freedesktop.FileManager1'
16:51:41 nautilus: Failed to register: Unable to acquire bus name 'org.gnome.Nautilus'
16:51:41 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gnome.Nautilus'
16:51:41 systemd: Started Virtual filesystem metadata service.
16:51:41 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gtk.vfs.Metadata'
16:51:41 systemd: Starting Virtual filesystem metadata service...
16:51:41 dbus-daemon: [session uid=1000 pid=8380] Activating via systemd: service name='org.gtk.vfs.Metadata' unit='gvfs-metadata.service' requested by ':1.94' (uid=1000 pid=9165 comm="gjs /usr/share/gnome-shell/extensions/zorin-deskto" label="unconfined")
16:51:41 polkitd: Unregistered Authentication Agent for unix-session:c2 (system bus name :1.168, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
16:51:41 gdm3: Gdm: Child process -8399 was already dead.
16:51:41 systemd-logind: Removed session c2.
16:51:41 systemd: session-c2.scope: Succeeded.
16:51:41 gsd-color: failed to connect to device: Failed to connect to missing device /org/freedesktop/ColorManager/devices/xrandr_LCD_MONITOR_1_gdm_124
16:51:41 systemd-logind: Session c2 logged out. Waiting for processes to exit.
16:51:41 gdm-session-wor: pam_unix(gdm-launch-environment:session): session closed for user gdm
16:51:41 dbus-daemon: dbus-daemon[8408]: [session uid=124 pid=8408] Activating service name='org.freedesktop.systemd1' requested by ':1.18' (uid=124 pid=8553 comm="/usr/libexec/gsd-sharing " label="unconfined")
16:51:41 gnome-shell: Registering session with GDM
16:51:41 touchegg: Using configuration file "/home/user/.config/touchegg/touchegg.conf"
16:51:41 evolution-calen: e_intervaltree_destroy: assertion 'E_IS_INTERVALTREE (tree)' failed
16:51:41 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gnome.Shell.Screencast'
16:51:40 gnome-shell: [x11gestures@joseexposito.github.io] Updating Touchégg configuration
16:51:40 systemd: Reached target Current graphical user session.
16:51:40 gnome-shell: Failed to set CRTC gamma: drmModeCrtcSetGamma on CRTC 50 failed: Permission denied
16:51:40 colord: failed to get session [pid 9004]: No data available
16:51:40 gsd-media-keys: Failed to grab accelerator for keybinding settings:rotate-video-lock
16:51:40 gnome-session-b: GnomeDesktop-WARNING: Could not create transient scope for PID 9079: GDBus.Error:org.freedesktop.DBus.Error.UnixProcessIdUnknown: Process with ID 9079 does not exist.
16:51:40 systemd: gnome-launched-snap-userd-autostart.desktop-9083.scope: Succeeded.
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Activating service name='org.gnome.Shell.Screencast' requested by ':1.79' (uid=1000 pid=9009 comm="/usr/libexec/gsd-media-keys " label="unconfined")
16:51:40 gnome-session-b: GnomeDesktop-WARNING: Could not create transient scope for PID 9033: GDBus.Error:org.freedesktop.DBus.Error.UnixProcessIdUnknown: Process with ID 9033 does not exist.
16:51:40 touchegg: Connection with Touchégg established
16:51:40 gnome-shell: Error looking up permission: GDBus.Error:org.freedesktop.portal.Error.NotFound: No entry for geolocation
16:51:40 NetworkManager: [1657756300.6747] agent-manager: agent[caafa22b07790702,:1.197/org.gnome.Shell.NetworkAgent/1000]: agent registered
16:51:40 systemd: Reached target GNOME RFKill support target.
16:51:40 kernel: rfkill: input handler disabled
16:51:40 systemd: Starting GNOME file sharing service...
16:51:40 gnome-shell: [x11gestures@joseexposito.github.io] Connection with Touchégg established
16:51:40 systemd: Starting GNOME accessibility service...
16:51:40 gnome-shell: st_widget_get_theme_node called on the widget [0x55977276ac40 Gjs_ui_animation_Spinner] which is not in the stage.
16:51:40 Xorg: (II) modeset(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gnome.Shell.Notifications'
16:51:40 systemd: Started Evolution address book service.
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gnome.evolution.dataserver.AddressBook10'
16:51:40 gnome-shell: [x11gestures@joseexposito.github.io] Connecting Touchégg client signals
16:51:40 touchegg: New client connected
16:51:40 gnome-shell: [x11gestures@joseexposito.github.io] Connecting to Touchégg daemon
16:51:40 systemd: Starting Evolution address book service...
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Activating via systemd: service name='org.gnome.evolution.dataserver.AddressBook10' unit='evolution-addressbook-factory.service' requested by ':1.62' (uid=1000 pid=8957 comm="/usr/libexec/evolution-calendar-factory " label="unconfined")
16:51:40 systemd: Started Evolution calendar service.
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gnome.evolution.dataserver.Calendar8'
16:51:40 systemd: tracker-extract.service: Succeeded.
16:51:40 gnome-shell: loading user theme: /usr/share/themes/ZorinGrey-Dark/gnome-shell/gnome-shell.css
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gnome.Shell.CalendarServer'
16:51:40 systemd: Starting Evolution calendar service...
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Activating via systemd: service name='org.gnome.evolution.dataserver.Calendar8' unit='evolution-calendar-factory.service' requested by ':1.50' (uid=1000 pid=8899 comm="/usr/libexec/gnome-shell-calendar-server " label="unconfined")
16:51:40 systemd: Started Virtual filesystem service - Media Transfer Protocol monitor.
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gtk.vfs.MTPVolumeMonitor'
16:51:40 systemd: Starting Virtual filesystem service - Media Transfer Protocol monitor...
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Activating via systemd: service name='org.gtk.vfs.MTPVolumeMonitor' unit='gvfs-mtp-volume-monitor.service' requested by ':1.37' (uid=1000 pid=8849 comm="/usr/bin/gnome-shell " label="unconfined")
16:51:40 systemd: Started Virtual filesystem service - Apple File Conduit monitor.
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gtk.vfs.AfcVolumeMonitor'
16:51:40 systemd: Starting Virtual filesystem service - Apple File Conduit monitor...
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Activating via systemd: service name='org.gtk.vfs.AfcVolumeMonitor' unit='gvfs-afc-volume-monitor.service' requested by ':1.37' (uid=1000 pid=8849 comm="/usr/bin/gnome-shell " label="unconfined")
16:51:40 systemd: Started Virtual filesystem service - GNOME Online Accounts monitor.
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gtk.vfs.GoaVolumeMonitor'
16:51:40 systemd: Starting Virtual filesystem service - GNOME Online Accounts monitor...
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Activating via systemd: service name='org.gtk.vfs.GoaVolumeMonitor' unit='gvfs-goa-volume-monitor.service' requested by ':1.37' (uid=1000 pid=8849 comm="/usr/bin/gnome-shell " label="unconfined")
16:51:40 systemd: Started Virtual filesystem service - digital camera monitor.
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gtk.vfs.GPhoto2VolumeMonitor'
16:51:40 systemd: Starting Virtual filesystem service - digital camera monitor...
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Activating via systemd: service name='org.gtk.vfs.GPhoto2VolumeMonitor' unit='gvfs-gphoto2-volume-monitor.service' requested by ':1.37' (uid=1000 pid=8849 comm="/usr/bin/gnome-shell " label="unconfined")
16:51:40 goa-daemon: goa-daemon version 3.36.1 starting
16:51:40 systemd: Started Virtual filesystem service - disk device monitor.
16:51:40 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gtk.vfs.UDisks2VolumeMonitor'
16:51:39 systemd: Started Evolution source registry.
16:51:39 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gnome.evolution.dataserver.Sources5'
16:51:39 evolution-sourc: ** Failed to load key file at 'file:///home/user/.config/evolution/sources/system-proxy.source': Data source is missing a [Data Source] group
16:51:39 dbus-daemon: [session uid=1000 pid=8380] Activating service name='org.gnome.OnlineAccounts' requested by ':1.52' (uid=1000 pid=8905 comm="/usr/libexec/evolution-source-registry " label="unconfined")
16:51:39 systemd: Starting Virtual filesystem service - disk device monitor...
16:51:39 dbus-daemon: [session uid=1000 pid=8380] Activating via systemd: service name='org.gtk.vfs.UDisks2VolumeMonitor' unit='gvfs-udisks2-volume-monitor.service' requested by ':1.37' (uid=1000 pid=8849 comm="/usr/bin/gnome-shell " label="unconfined")
16:51:39 gnome-shell: Telepathy is not available, chat integration will be disabled.
16:51:39 polkitd: Registered Authentication Agent for unix-session:13 (system bus name :1.197 [/usr/bin/gnome-shell], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
16:51:39 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'ca.desrt.dconf'
16:51:39 systemd: Starting Evolution source registry...
16:51:39 dbus-daemon: [session uid=1000 pid=8380] Activating via systemd: service name='org.gnome.evolution.dataserver.Sources5' unit='evolution-source-registry.service' requested by ':1.50' (uid=1000 pid=8899 comm="/usr/libexec/gnome-shell-calendar-server " label="unconfined")
16:51:39 systemd: Started sandboxed app permission store.
16:51:39 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.freedesktop.impl.portal.PermissionStore'
16:51:39 systemd: Starting sandboxed app permission store...
16:51:39 dbus-daemon: [session uid=1000 pid=8380] Activating via systemd: service name='org.freedesktop.impl.portal.PermissionStore' unit='xdg-permission-store.service' requested by ':1.37' (uid=1000 pid=8849 comm="/usr/bin/gnome-shell " label="unconfined")
16:51:39 at-spi2-registr: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry
16:51:39 dbus-daemon: dbus-daemon[8818]: Successfully activated service 'org.a11y.atspi.Registry'
16:51:39 gnome-shell: Will monitor session 13
16:51:39 Xorg: (II) modeset(0): Allocate new frame buffer 1280x1024 stride
16:51:39 systemd: gnome-launched-at-spi-dbus-bus.desktop-8850.scope: Succeeded.
16:51:39 gnome-session-b: GnomeDesktop-WARNING: Could not create transient scope for PID 8844: GDBus.Error:org.freedesktop.DBus.Error.UnixProcessIdUnknown: Process with ID 8844 does not exist.
16:51:39 systemd: Condition check resulted in GNOME Shell on Wayland being skipped.
16:51:39 gnome-keyring-d: SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
16:51:39 systemd: Started Application launched by gnome-session-binary.
16:51:39 gnome-session-b: GnomeDesktop-WARNING: Could not create transient scope for PID 8839: GDBus.Error:org.freedesktop.DBus.Error.UnixProcessIdUnknown: Process with ID 8839 does not exist.
16:51:39 gnome-keyring-d: The Secret Service was already initialized
16:51:39 gnome-session-b: WARNING: Could not parse desktop file remmina-applet.desktop or it references a not found TryExec binary
16:51:38 systemd: Starting GNOME Session Manager (session: zorin)...
16:51:38 rtkit-daemon: Supervising 14 threads of 6 processes of 2 users.
16:51:38 systemd: Started Accessibility services bus.
16:51:38 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.a11y.Bus'
16:51:38 systemd: Starting Accessibility services bus...
16:51:38 dbus-daemon: [session uid=1000 pid=8380] Activating via systemd: service name='org.a11y.Bus' unit='at-spi-dbus-bus.service' requested by ':1.14' (uid=1000 pid=8811 comm="/usr/libexec/gnome-session-check-accelerated " label="unconfined")
16:51:38 dbus-update-act: dbus-update-activation-environment: setting _=/usr/bin/dbus-update-activation-environment
16:51:38 xhost: localuser:user being added to access control list
16:51:38 dbus-update-act: dbus-update-activation-environment: setting XAUTHORITY=/run/user/1000/gdm/Xauthority
16:51:38 xhost: localuser:user being added to access control list
16:51:38 systemd: Started Virtual filesystem service.
16:51:38 dbus-daemon: [session uid=1000 pid=8380] Successfully activated service 'org.gtk.vfs.Daemon'
16:51:38 systemd: Starting Virtual filesystem service...
16:51:38 dbus-daemon: [session uid=1000 pid=8380] Activating via systemd: service name='org.gtk.vfs.Daemon' unit='gvfs-daemon.service' requested by ':1.5' (uid=1000 pid=8728 comm="flatpak --installations " label="unconfined")
16:51:38 Xsession: /etc/gdm3/Xsession: Beginning session setup...
16:51:38 Xorg: (**) Option "xkb_layout" "us"
16:51:38 kernel: rfkill: input handler enabled
16:51:38 gdm-session-wor: gkr-pam: gnome-keyring-daemon started properly and unlocked keyring
16:51:38 systemd: Started Session 13 of user user.
16:51:38 systemd-logind: New session 13 of user user.
16:51:38 gdm-session-wor: pam_unix(gdm-password:session): session opened for user user by (uid=0)
16:51:34 systemd-logind: Removed session 3.
16:51:34 systemd: session-3.scope: Succeeded.
16:51:33 xkbcomp: Errors from xkbcomp are not fatal to the X server
16:51:32 gnome-shell: Registering session with GDM
16:51:31 dbus-daemon: dbus-daemon[8408]: [session uid=124 pid=8408] Successfully activated service 'org.gnome.Shell.Screencast'
16:51:31 gnome-shell: cr_declaration_parse_list_from_buf: assertion 'parser' failed
16:51:31 gsd-media-keys: Failed to grab accelerator for keybinding settings:playback-repeat
16:51:31 xbrlapi: cannot connect to braille devices daemon brltty at :0
16:51:31 gnome-session-b: Entering running state
16:51:31 dbus-daemon: dbus-daemon[8408]: [session uid=124 pid=8408] Successfully activated service 'org.freedesktop.portal.IBus'
16:51:31 gnome-shell: cr_declaration_parse_list_from_buf: assertion 'parser' failed
16:51:31 systemd: Started Fingerprint Authentication Daemon.
16:51:31 dbus-daemon: [system] Successfully activated service 'net.reactivated.Fprint'
16:51:31 systemd: Starting Fingerprint Authentication Daemon...
16:51:31 dbus-daemon: [system] Activating via systemd: service name='net.reactivated.Fprint' unit='fprintd.service' requested by ':1.168' (uid=124 pid=8445 comm="/usr/bin/gnome-shell " label="unconfined")
16:51:31 gnome-shell: cr_declaration_parse_list_from_buf: assertion 'parser' failed
16:51:31 kernel: rfkill: input handler disabled
16:51:31 systemd: Started Hostname Service.
16:51:31 dbus-daemon: [system] Successfully activated service 'org.freedesktop.hostname1'
16:51:31 gsd-sharing: Failed to StopUnit service: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.freedesktop.systemd1 exited with status 1
16:51:31 dbus-daemon: dbus-daemon[8408]: [session uid=124 pid=8408] Activated service 'org.freedesktop.systemd1' failed: Process org.freedesktop.systemd1 exited with status 1
16:51:31 systemd: Starting Hostname Service...
16:51:31 dbus-daemon: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.177' (uid=124 pid=8570 comm="/usr/libexec/gsd-rfkill " label="unconfined")
16:51:31 gnome-shell: Error looking up permission: GDBus.Error:org.freedesktop.portal.Error.NotFound: No entry for geolocation
16:51:31 at-spi2-registr: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry
16:51:31 dbus-daemon: dbus-daemon[8506]: Successfully activated service 'org.a11y.atspi.Registry'
16:51:31 systemd: Started PackageKit Daemon.
16:51:31 dbus-daemon: [system] Successfully activated service 'org.freedesktop.PackageKit'
16:51:31 systemd: Started Location Lookup Service.
16:51:31 dbus-daemon: [system] Successfully activated service 'org.freedesktop.GeoClue2'
16:51:31 packagekitd: daemon start
16:51:31 systemd: Starting PackageKit Daemon...
16:51:31 dbus-daemon: [system] Activating via systemd: service name='org.freedesktop.PackageKit' unit='packagekit.service' requested by ':1.168' (uid=124 pid=8445 comm="/usr/bin/gnome-shell " label="unconfined")
16:51:31 polkitd: Registered Authentication Agent for unix-session:c2 (system bus name :1.168 [/usr/bin/gnome-shell], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
16:51:30 systemd: Starting Location Lookup Service...
16:51:30 dbus-daemon: [system] Activating via systemd: service name='org.freedesktop.GeoClue2' unit='geoclue.service' requested by ':1.168' (uid=124 pid=8445 comm="/usr/bin/gnome-shell " label="unconfined")
16:51:30 systemd: Startup finished in 950ms.
16:51:30 rtkit-daemon: Supervising 12 threads of 6 processes of 2 users.
16:51:30 dbus-daemon: dbus-daemon[8408]: [session uid=124 pid=8408] Successfully activated service 'org.freedesktop.impl.portal.PermissionStore'
16:51:30 systemd: Started Locale Service.
16:51:30 dbus-daemon: [system] Successfully activated service 'org.freedesktop.locale1'
16:51:30 systemd: Starting Locale Service...
16:51:30 dbus-daemon: [system] Activating via systemd: service name='org.freedesktop.locale1' unit='dbus-org.freedesktop.locale1.service' requested by ':1.168' (uid=124 pid=8445 comm="/usr/bin/gnome-shell " label="unconfined")
16:51:30 gnome-shell: Will monitor session c2
16:51:30 dbus-daemon: dbus-daemon[8408]: [session uid=124 pid=8408] Successfully activated service 'org.a11y.Bus'
16:51:30 gnome-shell: Disabling DMA buffer screen sharing for driver 'nouveau'.
16:51:30 systemd: Started Tracker metadata database store and lookup manager.
16:51:30 dbus-daemon: [session uid=124 pid=8401] Successfully activated service 'org.freedesktop.Tracker1'
16:51:30 systemd: Started Tracker file system data miner.
16:51:30 dbus-daemon: [session uid=124 pid=8401] Activating via systemd: service name='org.freedesktop.Tracker1' unit='tracker-store.service' requested by ':1.2' (uid=124 pid=8397 comm="/usr/libexec/tracker-miner-fs " label="unconfined")
16:51:30 systemd: Started Tracker metadata extractor.
16:51:30 dbus-daemon: [session uid=124 pid=8401] Successfully activated service 'org.gtk.vfs.MTPVolumeMonitor'
16:51:30 systemd: Starting Virtual filesystem service - Media Transfer Protocol monitor...
16:51:30 dbus-daemon: [session uid=124 pid=8401] Activating via systemd: service name='org.gtk.vfs.MTPVolumeMonitor' unit='gvfs-mtp-volume-monitor.service' requested by ':1.2' (uid=124 pid=8397 comm="/usr/libexec/tracker-miner-fs " label="unconfined")
16:51:30 systemd: Started Virtual filesystem service - Apple File Conduit monitor.
16:51:30 dbus-daemon: [session uid=124 pid=8401] Successfully activated service 'org.gtk.vfs.AfcVolumeMonitor'
16:51:30 systemd: Starting Virtual filesystem service - Apple File Conduit monitor...
16:51:30 dbus-daemon: [session uid=124 pid=8401] Activating via systemd: service name='org.gtk.vfs.AfcVolumeMonitor' unit='gvfs-afc-volume-monitor.service' requested by ':1.2' (uid=124 pid=8397 comm="/usr/libexec/tracker-miner-fs " label="unconfined")
16:51:30 systemd: Started Virtual filesystem service - GNOME Online Accounts monitor.
16:51:30 dbus-daemon: [session uid=124 pid=8401] Successfully activated service 'org.gtk.vfs.GoaVolumeMonitor'
16:51:30 goa-daemon: goa-daemon version 3.36.1 starting
16:51:30 dbus-daemon: [session uid=124 pid=8401] Activating service name='org.gnome.OnlineAccounts' requested by ':1.11' (uid=124 pid=8457 comm="/usr/libexec/gvfs-goa-volume-monitor " label="unconfined")
16:51:30 systemd: Starting Virtual filesystem service - GNOME Online Accounts monitor...
16:51:30 dbus-daemon: [session uid=124 pid=8401] Activating via systemd: service name='org.gtk.vfs.GoaVolumeMonitor' unit='gvfs-goa-volume-monitor.service' requested by ':1.2' (uid=124 pid=8397 comm="/usr/libexec/tracker-miner-fs " label="unconfined")
16:51:30 systemd: Started Virtual filesystem service - digital camera monitor.
16:51:30 dbus-daemon: [session uid=124 pid=8401] Successfully activated service 'org.gtk.vfs.GPhoto2VolumeMonitor'
16:51:30 systemd: Starting Virtual filesystem service - digital camera monitor...
16:51:30 dbus-daemon: [session uid=124 pid=8401] Activating via systemd: service name='org.gtk.vfs.GPhoto2VolumeMonitor' unit='gvfs-gphoto2-volume-monitor.service' requested by ':1.2' (uid=124 pid=8397 comm="/usr/libexec/tracker-miner-fs " label="unconfined")
16:51:30 systemd: Started Virtual filesystem service - disk device monitor.
16:51:30 dbus-daemon: [session uid=124 pid=8401] Successfully activated service 'org.gtk.vfs.UDisks2VolumeMonitor'
16:51:30 gnome-session-b: WARNING: Error while executing session-migration: Failed to execute child process “session-migration” (No such file or directory)
16:51:30 systemd: Starting Virtual filesystem service - disk device monitor...
16:51:30 dbus-daemon: [session uid=124 pid=8401] Activating via systemd: service name='org.gtk.vfs.UDisks2VolumeMonitor' unit='gvfs-udisks2-volume-monitor.service' requested by ':1.2' (uid=124 pid=8397 comm="/usr/libexec/tracker-miner-fs " label="unconfined")
16:51:30 tracker-miner-f: Unable to get XDG user directory path for special directory &VIDEOS. Ignoring this location.
16:51:30 gnome-session-b: WARNING: Falling back to non-systemd startup procedure due to error: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "org.freedesktop.systemd1" does not exist
16:51:30 systemd: Started Virtual filesystem service.
16:51:30 dbus-daemon: [session uid=124 pid=8401] Successfully activated service 'org.gtk.vfs.Daemon'
16:51:30 rtkit-daemon: Supervising 11 threads of 6 processes of 2 users.
16:51:30 systemd: Started Sound Service.
16:51:30 rtkit-daemon: Supervising 10 threads of 6 processes of 2 users.
16:51:30 systemd: Starting Virtual filesystem service...
16:51:30 dbus-daemon: [session uid=124 pid=8401] Activating via systemd: service name='org.gtk.vfs.Daemon' unit='gvfs-daemon.service' requested by ':1.3' (uid=124 pid=8396 comm="/usr/libexec/tracker-extract " label="unconfined")
16:51:30 rtkit-daemon: Supervising 5 threads of 3 processes of 1 users.
16:51:30 systemd: Condition check resulted in Bluetooth service being skipped.
16:51:30 dbus-daemon: [system] Activating via systemd: service name='org.bluez' unit='dbus-org.bluez.service' requested by ':1.160' (uid=1000 pid=8370 comm="/usr/bin/pulseaudio --daemonize=no --log-target=jo" label="unconfined")
16:51:30 pulseaudio: Failed to load module "module-alsa-card" (argument: "device_id="0" name="pci-0000_00_1f.3" card_name="alsa_card.pci-0000_00_1f.3" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1""): initialization failed.
16:51:30 dbus-daemon: [session uid=124 pid=8401] AppArmor D-Bus mediation is enabled
16:51:30 tracker-extract: Setting priority nice level to 19
16:51:30 systemd: Started D-Bus User Message Bus.
16:51:30 tracker-miner-f: Setting priority nice level to 19
16:51:30 systemd: Starting Tracker file system data miner...
16:51:29 (systemd): pam_unix(systemd-user:session): session opened for user gdm by (uid=0)
16:51:29 systemd: Starting User Manager for UID 124...
16:51:29 tracker-miner-f: OK
16:51:29 systemd-logind: New session c2 of user gdm.
16:51:29 systemd: Starting User Runtime Directory /run/user/124...
16:51:29 gdm-session-wor: pam_unix(gdm-launch-environment:session): session opened for user gdm by (uid=0)
16:51:29 dbus-daemon: [session uid=1000 pid=8380] AppArmor D-Bus mediation is enabled
16:51:29 systemd: Started D-Bus User Message Bus.
16:51:29 pulseaudio: Stale PID file, overwriting.
16:51:29 rtkit-daemon: Supervising 5 threads of 3 processes of 1 users.
16:51:29 systemd: gvfs-daemon.service: Succeeded.
16:51:29 evolution-addre: Error setting property 'ConnectionStatus' on interface org.gnome.evolution.dataserver.Source: The connection is closed (g-io-error-quark, 18)
16:51:29 systemd: xdg-permission-store.service: Main process exited, code=exited, status=1/FAILURE
16:51:29 evolution-calen: Error setting property 'ConnectionStatus' on interface org.gnome.evolution.dataserver.Source: The connection is closed (g-io-error-quark, 18)
16:51:29 systemd: gvfs-mtp-volume-monitor.service: Succeeded.
16:51:29 gvfsd: A connection to the bus can't be made
16:51:29 tracker-miner-f: Error while sending AddMatch() message: The connection is closed
16:51:29 systemd: Started Restart DBus after GNOME Session shutdown.
16:51:29 systemd-logind: Session 3 logged out. Waiting for processes to exit.
16:51:29 systemd: Stopped GNOME sound sample caching service.
16:51:29 polkitd: Unregistered Authentication Agent for unix-session:3 (system bus name :1.89, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
16:51:29 gdm-session-wor: pam_unix(gdm-password:session): session closed for user user
16:51:29 systemd: Stopped Monitor Session leader for GNOME Session.
16:51:29 kernel: rfkill: input handler enabled
16:51:29 systemd: Stopped Application launched by gnome-session-binary.
16:51:29 gnome-shell: gnome-shell: Fatal IO error 4 (Interrupted system call) on X server :0.

16:51:29 pulseaudio: X connection to :0 broken (explicit kill or server shutdown).
16:51:29 systemd: Failed to start GNOME Wacom tablet support service.
16:51:29 gsd-wacom: Cannot open display:
16:51:29 systemd: gnome-launched-waterfox-classic.desktop-5141.scope: Succeeded.
16:51:29 kernel: gsd-keyboard: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

16:51:29 kernel: gsd-color: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

16:51:29 gsd-power: gsd-power: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

16:51:29 gsd-media-keys: gsd-media-keys: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

16:51:29 systemd: org.gnome.SettingsDaemon.XSettings.service: Main process exited, code=exited, status=1/FAILURE
16:51:29 at-spi2-registr: X connection to :0 broken (explicit kill or server shutdown).
16:51:29 waterfox-classi: waterfox-classic: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

16:51:29 nautilus: org.gnome.Nautilus: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

16:51:29 gsd-wacom: gsd-wacom: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

16:51:29 gsd-xsettings: gsd-xsettings: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

16:51:29 evolution-alarm: evolution-alarm-notify: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

16:51:29 update-notifier: update-notifier: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

16:51:29 Web Content: /usr/lib/waterfox-classic/waterfox-classic: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

16:51:29 soffice.bin: X IO Error
16:51:29 Xorg: (EE) Server terminated with error (1). Closing log file.
16:49:58 soffice.bin: AVC apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/usr/share/zoneinfo-icu/44/le/timezoneTypes.res" pid=5560 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
16:49:58 kernel: audit: type=1400 audit(1657756198.589:54): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/usr/share/zoneinfo-icu/44/le/timezoneTypes.res" pid=5560 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
16:49:58 soffice.bin: AVC apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/usr/share/zoneinfo-icu/44/le/zoneinfo64.res" pid=5560 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0

While this has been (roughly) narrowed down to the event time, I still have no idea what's going on. Can anyone else make sense of this?

In your BIOS EFI settings, is TPM enabled? It would preferably be disabled.
If you are dual booting Windows 11 and Zorin OS, Windows may demand it be enabled.
TPM serves the purpose of providing a BackDoor for Microsoft to access your machine. Microsofts official stance is that this serves security purposes.

Can you run:

sudo apt install --reinstall policykit1 policykit1-gnome ca-certificates

Just did - got the following message:

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package policykit1
E: Unable to locate package policykit1-gnome

Also, I don't know if TPN is set (I only have Zorin on this machine), and until summer finals end, I'm afraid to look at the BIOS.

There was a security issue with Polkit across all GNU/Linux OS's for two years or more. It only got fixed in Feb/March this year. Do you get updates from Main Server? Also you should ditch Waterfox as that is now Spyware as no longer open-source. Try Flashpeak Slimjet Browser with built-in Blockers.

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Agreed. I also used to use (and Love) Waterfox. But the maintainer sold it and the buyer is... shady. It is a company that performs marketing analytics.

Sorry... try:

sudo apt install --reinstall policykit-1 policykit-1-gnome ca-certificates

Sorry for the pause - Just ran the code, and Zorin seemed to like it. I'll be using my Zorin build more often soon, so I'll see how the results turn out. Will keep y'all updated.

Also, it sucks hearing about Waterfox - barring that, there doesn't seem to be any real browser options I like. Slimjet looks good, but there's not enough review material on it I can find, so I don't think I will use it - sorry! If anyone knows of a good independent browser, or Firefox fork, that does work with the site, please let me know.

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