During a dist-upgrade on my development machine (Ubuntu Precise Beta), I got:
- a booted Ubuntu machine with no X (it starts, then shutdown a few seconds after)
- a X-in-debug-mode which doesn’t start either (baaaaad!)
/var/log/lightdm/x-0-greeter.log just in case and found:
** (process:21707): WARNING **: Error reading existing Xauthority: Error opening file: Permission denied Error writing X authority: Error opening file '/var/lib/lightdm/.Xauthority': Permission denied
Then the solution was:
sudo -s cd / setfacl -b . chown root:root . chmod 755 .
And don’t ask me why
/ suddently got an ACL owned by me (the UID 1000 account), I don’t know! Don’t ask me why any other directory didn’t get this ACL too, I still don’t know!.
It might be related to Licorn® somewhere, but I can’t seem to find how: Licorn® touches directories and applies ACLs only under
Anyway, problem solved. Not an Ubuntu bug ;-)