My relatives updated their Ubuntu and couldn't log into it after that. After entering password the screen blinked to black and returned to the login screen. When I saw the screen there was an Ubuntu user and a Guest user. I tried Ctrl + Alt + F1 and tried to log in as Ubuntu user it gave me "Incorrect login" error but the password was correct.
After spending a fair amount of time I was able to solve this problem which I want to share with community.
Problem one was that user name wasn't Ubuntu. It was home.
The second problem was that Ubuntu installed Nvidia drivers for the ATI Radeon video card.
To find user name out I booted Ubuntu into recovery mode by selecting it in grub menu. And then I chose the root console. Where I typed
cut -d: -f1 /etc/passwd
from a long list of weird usernames I made an assumption it's home and was right. Restarted computer with Ctrl + Alt + Delete. During login screen pressed Ctrl + Alt + F1 and logged in as home user.
By that time my relatives remembered that before update Ubuntu said something about Nvidia. But I knew they had ATI Radeon video card. So I wiped out all Nvidia drivers and reinstalled ubuntu-desktop using these commands
sudo apt-get remove --purge nvidia-*
sudo apt-get install ubuntu-desktop
sudo rm /etc/X11/xorg.conf
echo 'nouveau' | sudo tee -a /etc/modules
Rebooted with Ctrl + Alt + Delete and it worked. Hope this helps somebody
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