[SOLVED] Not able to login, probably after disk full

[solarjoe]

Hello,

I have a problem and hope that you can help me.

This morning my Linux Mint 19.3 refused to boot, it got stuck at the black screen after the logo and before login screen.
The reason was probably that the disk was full in the first place, this did not happen for the first time,
but usually the system booted fine after freeing up some disk space. But not this time.
(No, there is no time maschine snapshot)

From what I found out so far the problem seems to be related to lightdm and maybe a greeter.
The lightdm.service does not start.
I tried most of the things mentioned at https://www.debugpoint.com/failed-to-start-lightdm/ but also without success.

I pasted some info as pictures (sorry) at https://imgur.com/a/h9PDPl5

Do you have some idea what could be the reason?

Kind regards,
joe

[solarjoe]

Just saw that there is a line

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(EE) AIGLX error: dlopen of /usr/lib/x86_64-linux-gnu/dri/i965_dri.so  failed, cannot open shares object file (no such file or directory).

in Xorg.0.log

[Termy]

Can you get to the login screen? If so, switch to a different TTY (IE: Ctrl + Alt + F4), log in, then run df -h /. This will display the disk usage of '/', allowing you to see whether it's full. If it is, you might want to run sudo apt-get autoremove and then sudo apt-get clean to clear up potentially a fair bit of disk space therein. Use systemctl reboot to reboot, once those commands are finished. Once that's all done, you could begin better assessing disk space, so as to prevent this happening again.

[manyroads]

If all you want to do is clean p your disk over load, try booting using a live USB and then off-loading files to another USB device or the Net.

FWIW having NO Backup is a REALLY BAD idea.

[SMG]

Moderator note: Two topics on the same issue have been merged. Please only create one topic for an issue.

[SMG]

Do you have some idea what could be the reason?

Welcome to the forum, solarjoe.

For anyone to be able to help you, you need to give us an idea of what kind of computer this is and what happened the day before you had this issue. Did you run updates? LightDM does not just spontaneously not start. Something must happen for that to occur. Please give us some ideas of what you may have done.

It would be really helpful if you booted to your install usb/dvd to a live session of Linux Mint and then gave us information. You can do that by opening the System Reports app and clicking the System Information tab on the left. Your computer's information should come up in the right pane. Then click Copy, and paste the results into a reply window here so we can see how Linux Mint views your hardware.

[solarjoe]

I did all the apt cleanup stuff before posting here, of course
And I did not say, that there is no backup, I have rsync snapshots of ~, but at some point I stopped backing up / .

I was using the current mesa drivers from

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ppa:kisak/kisak-mesa

and there might
have been some hickup with the normal updates.
The missing driver mentioned in Xorg.0.log

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/usr/lib/x86_64-linux-gnu/dri/i965_dri.so

led to a seg fault in the end and the display server failed to start.

Since I need the new mesa drivers to get hardware acceleration in Firefox and Cinnamon I decided to
upgrade my 19.3 to 21. At the moment I am at 20.3, nearly there
So I am closing this now, thanks for your help!