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Today I tried to boot Ubuntu with 9wm (which I had installed before), first by modifying the GRUB boot from 'quiet splash' to 'text', later adding it to LightDM. As it didn't work, I removed the LightDM entry and restored GRUB. But when I try to login with any window manager in LightDM, it just stops and opens LightDM again. If I try to run startx from a TTY, it shows errors, saying all time that No protocol specified. What can I do?

UPDATE: It just happens with my user, logging in with another one works.

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up vote 3 down vote accepted

Surprisingly, the workaround for this problem is very simple. Just remove all .Xauthority files in your home folder with this command:

rm ~/.Xauthority*
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If removing ~/.Xauthority doesn't work, you may be out of disk space. I assume it has something to do with not being able to log what it needs to log.

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