As I mentioned in the upstream bugreport: I removed gdm from my default startup procedure, and started it by hand. Now everything was fine.
This tells me that this issue is not an issue of gdm, but more an issue of how my machine boots up and the state my machine is in at the time gdm is started. Upstream closed the bug with reason 'NOTABUG'. I asked them If they had any idea of what could create this situation. Does anybody out here have an idea about this? -- First attempt to login on gdm fails https://launchpad.net/bugs/46193 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs