This bug seems not to be related to GDM at all. This is a problem either
with automount, or mount.nfs4.
I did spend some time today digging around this and found out that the
hang lasts for several minutes, but then the system springs back to life
and the user list in the greeter will get populate
Thank you for taking the time to report this bug and helping to make
Ubuntu better. The issue you are reporting is an upstream one and it
would be nice if somebody having it could send the bug to the developers
of the software by following the instructions at
https://wiki.ubuntu.com/Bugs/Upstream/G
