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Ubuntu gets stuck in a login loop

Solutons:


I had this and after looking at /var/log/Xorg.0.log I found out that it’s a Nvidia problem (there was a line saying Xlib: extension "GLX" missing on display ":0).

I realized I have Nvidia drivers from official website which are not really stable and tested (so I’ve read and also experienced in the past).

The solution here was to install package nvidia-current from Ubuntu repos; it is an awfully outdated version, but it’s tested properly at least. Its installer is quite capable too and it uninstalled successfully my hack-installed unstable version from Nvidia website.

TL;DR, just try logging into the shell (Ctrl+Alt+F2 or whatever F between F1 and F6) and type

sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt update
sudo apt install nvidia-367

If it succeeds, reboot.

sudo reboot

If you’re lucky enough, problem solved, you should be able to login to Unity.

UPDATE

Please note that sometimes nvidia-current might install the wrong driver. In that case, search the latest compatible driver for your video card and install it. For example, on Ubuntu 16.04, nvidia-current points to the version: 304.131-0ubuntu3. This might be incompatible with your graphics card; therefore, search with sudo apt-cache search nvidia-[0-9]+$ for the package you need, and install it.

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