Cannot login to Ubuntu 16.04 after updating

Question

I use Ubuntu 16.04 and installed NVIDIA driver. Today after doing automatically proposed update, I cannot login to Ubuntu. I tried these ways:

• deleting NVIDIA or deleting /home/*/.Xauthority files (Can't login to Ubuntu 16.04 after upgrade)
• Uninstalling ubuntu-desktop and installing xubuntu-desktop(https://superuser.com/q/1106510)

But no one could help me. I think problem is caused by disabling some things during installing NVIDIA. How I can solve my problem?

Answer 1

Press CTRL+ALT+F2 and log in. Next purge all of the installed nvidia-drivers:

sudo apt purge nvidia-*

Install proprietary Nvidia driver again. First of all check which version proprietary driver is suitable for you, run in terminal:

ubuntu-drivers devices

You'll see something like this:

== /sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0 ==
modalias : pci:v000010DEd00000A65sv00001043sd00008354bc03sc00i00
vendor   : NVIDIA Corporation
model    : GT218 [GeForce 210]
driver   : nvidia-340 - distro non-free recommended
driver   : xserver-xorg-video-nouveau - distro free builtin

Pay your attention to the line with distro non-free recommended - there is exact name of package you may install - in the example above it's nvidia-340. Install the detected driver (change driver version 3XX in the command below to your detected version):

sudo apt install nvidia-3XX

Reboot computer:

sudo reboot

Check Nvidia proprietary driver in use, run in terminal:

nvidia-smi

Remark. Another way to install recommended proprietary drivers is command:

sudo ubuntu-drivers autoinstall