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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'

EDIT2:

$ 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: /home /opt were binary and inaccessible files. Only as root I could navigate the directories and copy them to a usb.

marked as duplicate by karel, user117103, Sumeet Deshmukh, Zanna, user364819 Jun 11 '17 at 13:11

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Try ctrl + alt + f2 – Arun Jun 10 '17 at 9:27
  • Same thing happens in all the tty 1-6. I've made vid and saw that it says "unable to cd to /home/user" for 0.1 seconds – KnotSaw Jun 10 '17 at 9:34
  • You mean graphical login prompt? – Arun Jun 10 '17 at 9:46
  • This login youtube.com/watch?v=tdL7d7wBxk8. Just the black screen. – KnotSaw Jun 10 '17 at 9:50
  • Please boot into a root shell and run namei -xl /home/* and edit your question with the result – steeldriver Jun 10 '17 at 12:55

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