I've now got a workaround: Append '-l' to the umount command in /etc/security/pam_mount.conf. That causes umount to remove the volume from the filesystem immediately and unmount it properly when it is no longer busy (i.e. gconfd exits).
-- The gconf daemon takes upto one minute to exit https://launchpad.net/bugs/45002 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs