Comment 49 for bug 531027

After getting "GLib WARNING **: getpwuid_r(): failed due to unknown user id (0)" on fresh install of Lubuntu 10.4 and reading lots of posts, I looked and /var/log/lxdm.log and found a message stating that no screens could be detected. I then found there was a rahter empty xorg.conf in /etc/X11. I renamed it to xorg.conf.bak and rebooted and whala - problem solved (for me at least).