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I recently did a:

sudo apt update && sudo apt upgrade -y

And have been unable to boot since.

Fortunately, I can boot into recovery mode but I am having trouble diagnosing the issue. I've pulled the logs from both the unsuccessful boot and the successful recovery boot but I am too new at this to be able to pick up any glaring red flags. If anyone has a moment to spare, would you be willing to point me in the right direction?

The full journalctl -b log for the unsuccessful boot can be found here. And the full journalctl -b log for the successful boot into recovery mode can be found here.

I see some stuff near the end of the "successful" recovery boot that sounds unpromising to the beginner, a lot of last-resort fallback's and such. I could be looking in the entirely wrong area though, I am not too familiar with the boot process.

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    Are there any files related to LightDM in /var/log?
    – grawity_u1686
    Commented Jan 26 at 5:58
  • Start up and interrupt the boot so as to start in a terminal. ............ Try sudo apt-get update && sudo apt-get autoclean && sudo apt-get clean && sudo apt-get autoremove
    – anon
    Commented Jan 26 at 13:14
  • @u1686_grawity Yes, there are several logs related to LightDM in /vat/log. As follows: lightdm.log seat0-greeter.log x-0.log x-1.log lightdm.log.old seat0-greeter.log.old x-0.log.old x-1.log.old
    – jackthetripperr
    Commented Jan 27 at 1:59
  • I'd suggest taking a look at the newest lightdm.log and maybe other files that are from the same time – your system log shows that lightdm itself is starting, but then it's not launching X to display the graphical logon screen for some reason.
    – grawity_u1686
    Commented Jan 27 at 10:55

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