Your kernel version is correct. Synaptic install is just sudo apt install synaptic
Email notifications - there is this Email notifications? but other than that I live here, so I don’t use them.
dpkg -s synaptic
Package: synaptic
Status: install ok installed
Priority: optional
Section: admin
Installed-Size: 3248
Maintainer: Ubuntu Developers ubuntu-devel-discuss@lists.ubuntu.com
Architecture: amd64
Version: 0.84.3ubuntu1
Depends: libapt-inst2.0 (>= 0.8.16~exp12), libapt-pkg5.0 (>= 1.1~exp9), libc6 (>= 2.14), libept1.5.0, libgcc1 (>= 1:3.0), libgdk-pixbuf2.0-0 (>= 2.22.0), libglib2.0-0 (>= 2.14.0), libgtk-3-0 (>= 3.3.16), libpango-1.0-0 (>= 1.14.0), libstdc++6 (>= 5.2), libvte-2.91-0, libxapian30, hicolor-icon-theme, policykit-1
Recommends: libgtk2-perl (>= 1:1.130), rarian-compat, xdg-utils
Suggests: dwww, menu, deborphan, apt-xapian-index, tasksel, software-properties-gtk
Conflicts: menu (<< 2.1.11)
dpkg -s zorin-os-desktop
Package: zorin-os-desktop
Status: install ok installed
Priority: optional
Section: metapackages
Installed-Size: 12
Maintainer: Artyom Zorin azorin@zoringroup.com
Architecture: amd64
Source: zorin-os-meta
Version: 1.4.10
Depends: alsa-base, alsa-utils, anacron, at-spi2-core, bc, ca-certificates, fonts-dejavu-core, fonts-freefont-ttf, fonts-zorin-os-core, foomatic-db-compressed-ppds, gdm3, genisoimage, ghostscript-x, gnome-calculator, gnome-control-center, gnome-logs, gnome-menus, gnome-session-canberra, gnome-settings-daemon, gnome-shell, gnome-shell-extensions-zorin-desktop, gnome-system-monitor, gstreamer1.0-alsa, gstreamer1.0-packagekit, gstreamer1.0-plugins-base-apps, gstreamer1.0-pulseaudio, gvfs-bin, inputattach, language-selector-gnome, libatk-adaptor, libnotify-bin, libsasl2-modules, libu2f-udev, openprinting-ppds, printer-driver-pnm2ppa, pulseaudio, rfkill, software-properties-gtk, spice-vdagent, ubuntu-drivers-common, ubuntu-release-upgrader-gtk, unzip, update-manager, update-notifier, wireless-tools, wpasupplicant, xdg-user-dirs, xdg-user-dirs-gtk, xkb-data, xorg, yelp, zenity, zip, zorin-desktop-session, zorin-os-artwork, zorin-os-default-settings
Recommends: acpi-support, adwaita-icon-theme-full, aisleriot, alacarte, app-install-data-partner, appstream-data-zorin-os, avahi-autoipd, avahi-daemon, baobab, bluez, bluez-cups, brasero, brltty, cheese, chrome-gnome-shell, cups, cups-bsd, cups-client, cups-filters, deja-dup, dirmngr, eog, evince, evolution, evolution-ews, file-roller, firefox, flatpak, folder-color, fonts-indic, fonts-kacst-one, fonts-khmeros-core, fonts-lao, fonts-liberation, fonts-lklug-sinhala, fonts-noto-cjk, fonts-noto-color-emoji, fonts-sil-abyssinica, fonts-sil-padauk, fonts-thai-tlwg, fonts-tibetan-machine, fonts-ubuntu, fwupd, fwupdate, fwupdate-signed, gamemode, gedit, gimp, gir1.2-gmenu-3.0, gnome-accessibility-themes, gnome-bluetooth, gnome-calendar, gnome-characters, gnome-clocks, gnome-contacts, gnome-disk-utility, gnome-font-viewer, gnome-keyring, gnome-mahjongg, gnome-maps, gnome-mines, gnome-power-manager, gnome-screenshot, gnome-software, gnome-software-plugin-flatpak, gnome-software-plugin-snap, gnome-sudoku, gnome-sushi, gnome-terminal, gnome-todo, gnome-weather, gpg-agent, gufw, gvfs-fuse, hplip, ibus, ibus-gtk, ibus-gtk3, ibus-table, im-config, kerneloops, laptop-detect, libnss-mdns, libpam-fprintd, libpam-gnome-keyring, libproxy1-plugin-gsettings, libproxy1-plugin-networkmanager, libreoffice-base, libreoffice-calc, libreoffice-draw, libreoffice-gnome, libreoffice-impress, libreoffice-writer, libwmf0.2-7-gtk, memtest86+, mousetweaks, nautilus, nautilus-sendto, nautilus-share, network-manager, network-manager-config-connectivity-zorin, network-manager-openvpn-gnome, network-manager-pptp-gnome, orca, p7zip-full, packagekit, pcmciautils, pitivi, plymouth-theme-zorin-logo, plymouth-theme-zorin-text, policykit-desktop-privileges, ppa-purge, ppp, pppconfig, pppoeconf, printer-driver-brlaser, printer-driver-c2esp, printer-driver-foo2zjs, printer-driver-m2300w, printer-driver-min12xxw, printer-driver-ptouch, printer-driver-pxljr, printer-driver-sag-gdi, printer-driver-splix, pulseaudio-module-bluetooth, quadrapassel, remmina, rhythmbox, seahorse, shotwell, simple-scan, snapd, speech-dispatcher, system-config-printer, totem, vino, xcursor-themes, xdg-utils, zorin-appearance, zorin-appearance-layouts-shell-core, zorin-connect, zorin-exec-guard, zorin-os-docs, zorin-os-file-templates, zorin-os-printer-test-page