I encountered this bug when upgrading from Ubuntu 11.04 to 11.10. I read
all the comments from this issue and the accompanying issue mentioned
previously, then I resolved this issue by doing the following actions
(in this order):

sudo dpkg-reconfigure lightdm
sudo apt-get purge gdm
sudo rm /var/var/dbus/pid
su root
created directories /run and /run/lock (these already existed)
moved contents of /var/run into /run and /var/lock into /run/lock,
delete directories /var/run and /var/lock
create replacement simlinks; e.g. 'ln -s /run /var/run' and 'ln -s /run/lock 
/var/lock'
reboot

I rebooted twice just to be sure since I went through part of this
process once, resolved it, then the problem reappeared after reboot. The
problem only stayed resolved after doing ALL of the above steps. Had I
been an uneducated user (not a techie) I would have been really angry.
Ubuntu community needs to upgrade the OS soon to fix this. This is a
huge issue since the machine UI was unusable until this fix was in
place!

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https://bugs.launchpad.net/bugs/856810

Title:
  Boot hangs at "Booting system without full network configuration..."

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