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I was using Ubuntu 14.04, after updating it to 15.10 using terminal I restarted the system. But then it started to boot into a Terminal similar to MS-DOS. And I've keyed in my credentials then the next prompt was " To run a command as admin (user'root'), use "sudo " ".

How can I solve this. I got important files in the hard drive.

Salman Faris M
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  • Try reinstalling the Desktop package: sudo apt-get install --reinstall ubuntu-desktop –  May 12 '16 at 18:31

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I had the same problem occurring to me (Ubuntu 14.04 LTS). I thought it was because I was trying out startx -command with sudo.

Later I found out that the ~/.Xauthority -file was being owned by root, so at the login screen I hit ctrl+alt+f2 and from there I changed the ownership back to me (sudo chown user:user .Xauthority) and was able to login again.

Sinscary
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  • I've tried it, but it prompts "chown: invalid user: 'user:salman' ". What should I do then. Would please suggest any other method. Please elaborate as I'm kind of newbie to command shell operations. – Salman Faris M May 13 '16 at 02:39
  • have you tried running this command sudo apt-get install --reinstall ubuntu-desktop as suggested by @Bhardwaj Raju – Sinscary May 13 '16 at 03:15
  • also try to run sudo init 5 . – Sinscary May 13 '16 at 03:18
  • also have a look at this answer - http://askubuntu.com/a/67723 , it seems to have solved this issue for many users. – Sinscary May 13 '16 at 03:21