Comment 90 for bug 254668

Just a few minutes after my last comment, I stumbled upon this thread:
http://backports.ubuntuforums.com/showthread.php?p=6036473
which, at least for me and probably Grizzly, includes the solution of the issue (tested on boot time, I have to do another shutdown after writing this :-)

I changed /etc/network/interfaces and commented out everything concerning a non-automatic configuration of eth0. Now it looks similar to this snippet:
auto eth0
# iface eth0 inet dhcp
# address 192.168.99.4
# netmask 255.255.255.0
# gateway 192.168.99.1

I had to leave the settings for the loopback device as they are, otherwise the nfsd hung in a timeout. You'll find the modified file attached.

(BTW: I guess, the gconf-error (described by Grizzly) has vanished, too, but I haven't memorized the way to reproduce it, so I'll just have to wait and see)