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My ubuntu was working ( it was having a working graphics driver), but I changed my root password then immediately the power was gone ( forced shutdown).

Then next time I restart my ubuntu I get this error:

The system is running in low graphics mode

I have seen this How to fix "The system is running in low-graphics mode" error? but it talks about installing and updating drivers and I dont think I need that.

I am looking for explanation that relates root password change and the error message I get

update:
when I hit ctrl+alt+F1 on recovery mode boot it gets stuck after printing:
Loading extension GLX

Thanks,

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2 Answers 2

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Run grep EE /var/log/Xorg.0.log

I'd you get something similar to: [ 247.145] (EE) open /dev/dri/card): No such file or directory

Then the problem lies in having a video driver set up wrong. For example if you have an intel video card and have a Nvidia driver installed it won't work.

Run lspci and find your video adapter. If it's mixed matched you can run a purge command :

sudo apt-get purge nvidia-*

Where nvidia is an example for a driver that needs intel, but is instead forced with an Nvidia driver

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  • Thanks, but see below what the problem was.
    – t31321
    Jan 12, 2015 at 6:16
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While it is stuck saying:
Loading extension GLX

I hit ctrl+c then it was logging a lot things ( most of them daemon activities) very fast , then lucky enough I saw a line that says your system is having low disk space.

Then:

  1. I restarted to recovery mode again

  2. Choose root [drop to root]

  3. Then going to the directories I stored my files; I created some space(deleted some video files that I dont need)

  4. Reboot

  5. my system is working!

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