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This question already has an answer here:

My ubuntu is in trouble,

I changed my graphic card, tryed some manipulations, and now I get some problems with the login-screen.

I have the login-screen, normal, but when I type on password ( I am sure it's the good one, ssh work fine ), after I valid I get a black screen, some rapid text in textmode, but I can't read, and next the login-screen again.

I tryed to find something strange in Xorg logs, but I don't found. I am not sure to look at the good place.

My card is an ATI RS690. I use VGA for now, but I plan to use it on HDMI.

Ubuntu 13.10 / lightdm


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marked as duplicate by Takkat, Eric Carvalho, Richard, Avinash Raj, Warren Hill Apr 2 '14 at 7:53

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.

link – user255125 Apr 1 '14 at 13:07
Here the image of the screen. So I see no bugs, or other problems. got from a camera. – user255125 Apr 1 '14 at 13:07
Try this solution:… - it still works in 13.10 – Takkat Apr 1 '14 at 17:59
Ok thanks, it worked. The VGA is working fine now, but I still don't have any signal in HDMI :/. And the ubuntu offer me to report a problem. Apache2 crashed with SIGSEGV. And the window system is very slow. – user255125 Apr 1 '14 at 21:58
That's great news :) We will then have to mark your question as a duplicate to direct other people to the solution. For your other issues you also may find solutions here (except the crash - this is as bug off topic here). – Takkat Apr 1 '14 at 22:01
up vote 0 down vote accepted

Actually your xauthority file ownership has changed so only you cant able login to GUI go to single user mode and change the .Xauthority owenrship to ur user this will slove

sudo chown username:username .Xauthority
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Maybe Xauthority issue.

Goto command mode using this command Select Ctrl+Alt+F2.

Enter your username and password, then check the .Xauthority file it is in /home/username

ls -la

sudo rm .Xauthority*
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