Ubuntu natty not displaying PDF thumbnails on nfs drives

Since natty, apparmor denies evince (nautilus thumbnailer) access to network drives. This results in long delays and PDF thumbnails not displaying.

Edit /etc/apparmor.d/usr.bin.evince like this (insert the nameservice-line):

/usr/bin/evince-thumbnailer {
  #include <abstractions/evince>
  #include <abstractions/nameservice>
:

Then do

$ sudo apparmor_parser -r /etc/apparmor.d/usr.bin.evince

Thumbnails should now display again, and without delay.

Ref: https://bugs.launchpad.net/ubuntu/+source/evince/+bug/778638