On 22.08.2012 00:00, Johannes Rohr wrote:
> Indeed, this issue is caused by wrong permissions.
>
> in  /var/lib/lightdm/x-0-greeter.log it said:
>
> ** (process:2235): WARNING **: Error reading existing Xauthority: Error 
> opening file: Permission denied
> Error writing X authority: Error opening file '/var/lib/lightdm/.Xauthority': 
> Permission denied
>
> And indeed, For some unkown reason, the files in /var/lib/ligthdm were
> owned by user speech-dispacher, group rtkit. After changing the owner of
> the files inside the directory to lightdm:lightdm, things work just
> fine.
>
A simple "sudo chown -R /var/lib/lightdm lightdm" fixed the issue for
me. I am just wondering why "sudo apt-get purge lightdm && sudo apt-get
install lightdm" didn't resolve this...

Whatever, seems to be caused by me always using developer releases. The
issue is gone for me now :)

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https://bugs.launchpad.net/bugs/951555

Title:
  When using lightdm X starts in low-graphics-mode

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