When I try to log it shows the desktop background then shows a black screen and then It takes me back to the log in screen...

I can't even log in as guest, I tried with Ctrl + alt + F1 and I can log in from terminal. I did some of research and tried solutions like:

sudo chmod -R ug+rwx /home/[username]

chown -R [user-name]:[user-name] /home/[user-name]

sudo mv .Xauthority .XauthorityBak

Tried also installing sudo apt-get install ubuntu-session

Well but none of them worked, what else can I do?

  • What is your video adapter? Did you install any drivers for it? If yes, how you did it?
    – Pilot6
    Oct 25, 2015 at 20:21
  • Hi, yes I have a Radeon graphic card but installed the drivers long time ago, but everything was working in the normal fashion until the update. I do not remember how I installed the drivers, how can I check if issue is coming from graphic card?
    – svelandiag
    Oct 25, 2015 at 20:22
  • You could install the drivers a wrong way, if you downloaded them from AMD site.
    – Pilot6
    Oct 25, 2015 at 20:24
  • But everything was working!, if I would had installed drivers wrong then problem would have occurred long time ago, am I wrong?
    – svelandiag
    Oct 25, 2015 at 20:25
  • 2
    It is 99% that it is related to video drivers.
    – Pilot6
    Oct 25, 2015 at 20:28

1 Answer 1


You can get into console by pressing Ctrl+Alt+F1.

You can login there and install or remove drivers.

If your video adapter is new, run

sudo apt-get install --reinstall fglrx-updates

That will install AMD drivers.

You can remove them by

sudo apt-get purge 'fglrx.*'

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .