Comment 14 for bug 871667

bug #855773 was similar and closed, Robert wrote "For the recent security fix LightDM has to drop privileges to write the authority file, but I guess it could be set wrong." and "I'm going to close this. I think lightdm can't do anything sane in this case. Thanks for the bug report!"

So it might not be a lightdm issue since the owner doesn't match what lightdm would set?