Same for me as per comment #14 (with the addition of NFS automounted homedirs).
If I shutdown lightdm: sudo /etc/init.d/lightdm stop and start gdm: sudo /etc/init.d/gdm start then I can login to the desktop.
To avoid doing this every time I startup my pc I had to change default manager to gdm with: sudo dpkg-reconfigure lightdm
Same for me as per comment #14 (with the addition of NFS automounted homedirs).
If I shutdown lightdm:
sudo /etc/init.d/lightdm stop
and start gdm:
sudo /etc/init.d/gdm start
then I can login to the desktop.
To avoid doing this every time I startup my pc I had to change default manager to gdm with:
sudo dpkg-reconfigure lightdm