After I push the power button to start the PC, but before the splashscreen (the black screen with the pulsing white Zorin exagon in the lower part) Linux shown some rows (around 25-30) but they went so fast and I couldn't read what they are. There is a way to slow them down or read them in a log file elsewhere?
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Hmm, could just be the backend logs for internalizing hardware/starting the system up typically i observe these more on one of my systems thats arch linux based, If theirs no negative impacts on your system i wouldn't be too worried, considering zorin is pretty stable.
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You can always launch Logs to see what is happening. You could also try hitting Ctrl+ Alt+ F2 to launch a tty terminal screen at boot time. You will be asked for your username then password to logon. You could then enter
startx
Which will launch the xorg display server but you should get some text scroll by. Just to add, Zorin defaults to Wayland compositor to draw the desktop. If you have an nVidia graphics card/chipset you are better off changing to xorg. When you choose your username at login a cog appears lower right, click on it and changee to Zorin on xorg.
@DotWayton All is going well on the ZorinOs so I'm not worried at all. These row was shown starting few days ago, probably when I changed the login wallpaper with another one taken by the official KDE repo (I'm on Zorin with KDE). I'm just courious on what that row are
@swarfendor437 I was and I'll be always on X11 using Xwayland 'coz my nVidia graphic card. I'll try to start the terminal and see what the xorg display will say. THX.
Since that output comes before the system starts, Logs can't collect them. You can make a video with your phone or increase the boot time enough to read them. By the way it's probably better and easier to take a video of the boot moment and pause to read the output rather than editing the configuration file that manages that. I also had some output there but the OS works.
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Did a video. 30 alternate rows of:
12.[xxxxxx] index 1 is out of range for type 'yyyyyyyyy'
12.[xxxxxx] UBSAN: array-index-out-of-bounds in /var/lib/dkms/virtualbox/6.1.50/build/vboxdrv/SUPDrvGip.c.xxxxxetcetera
as show in the screenshot
Never installed a virtualbox on this PC!!!!
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Boot logs can be shown with the command dmesg
After the system boots, launch the terminal and use it with sudo:
sudo dmesg
If you want error logs only:
sudo dmesg --level=err
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Great! exactly what I asked!
But why the OS sign a virtual box error if I never install one of them???
[ 12.189788] UBSAN: array-index-out-of-bounds in /var/lib/dkms/virtualbox/6.1.50/build/vboxdrv/common/log/log.c:1728:38
[ 12.189800] index 1 is out of range for type 'uint32_t [1]'
[ 12.194439] UBSAN: array-index-out-of-bounds in /var/lib/dkms/virtualbox/6.1.50/build/vboxdrv/r0drv/linux/memobj-r0drv-linux.c:383:33
etcetera etcetera
Did you install GNOME Boxes, or any other program related to virtual machines? Virtualbox being what it is, some programs use it as the backend.
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No, never installed it on this machine. I tried it once on another PC with Win7, (if I right remember), years ago, but I couldn't get it to work and never tried again, also because it's something I've never needed, at least until now.
Is it somethings I can delete reaching the var/lib/dkms/ and erase the virtualbox directory? Or better use sudo apt purge virtualbox*?
Or would it be ultra better not to do anything, since ZorinOS works just fine also with this errors?
The errors are harmless if not using VirtualBox.
But you might have more luck, if wanting to remove, with:
sudo apt remove --purge virtualbox-dkms
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