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Over night, so possibly after an update, my GUI login into Ubuntu 16.04 does not work anymore.

So I open another console (Ctrl+Alt+F3) and everything works fine.

I tried the stuff I found elsewhere: something with removing ~/.Xauthority.

In ~/.xsession-errors file I found at least the keyword, that others used to detect their errors: something with GLX.

In the end I did:

sudo apt autoremove nvidia-*
sudo apt install nvidia-current

GUI login still does not work.

.xsession-errors says:

extension "GLX" missing on display ":0".
openConnection: connect: No such file or directory
cannot connect to brltty at :0
upstart: ..... ...

  • nividia-current actually installs an old driver meant only for legacy hardware. Probably NOT the one you need. – user692175 Jan 17 '18 at 13:39
  • And how do I find out which one I need? – Veronika R. Jan 17 '18 at 13:40
  • Geforce.com or nvidia.com to search for the supported driver versions. Do not install from there. Install the recommended version from the official Ubuntu repositories, if available, or add a PPA providing newer versions (only required for brand new chipsets). But before all that you need to uninstall all (and the command you used doesn't do that), use sudo apt purge nvidia*. – user692175 Jan 17 '18 at 13:47
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for all the dummies like me: first

sudo apt purge nvidia*

find out which graphics card you have with:

lspci | grep VGA

then look up which driver you need on nvidia.com search for it in the repositories with

 sudo apt-cache search nvidia-* 

(or add further numbers to shorten the list). Install it with

sudo apt install nvidia-YOURNUMBER

then

reboot

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