This question already has an answer here:
I'm trying to fix the “the system is running in low graphics mode” problem. When I press Ctrl+Alt+F1 to go to tty1 and login, it goes straight back to the login prompt. Why does this happen and how can I get to the terminal?
Running Ubuntu 14.04.5 on an Asus laptop with nvidia card.
EDIT: After i try to login it says
unable to cd to '/home/user'
$ namei -xl /home/* f: /home/user $Drw-rw-rw- root root / $drwxr-xr-x root root home $drwxr-xr-x user user user
EDIT3: Thanks for the time and help. I booted Ubuntu from usb and backed up important files and reinstalled Ubuntu. It appeared that all files were changed to root? All directories like:
/opt were binary and inaccessible files. Only as root I could navigate the directories and copy them to a usb.