[Bug 81670] Re: failed to initialize HAL : gdm init script priority should be at least equal to dbus one

[Florent Mertens]

Restarting the all dbus init scripts during a gnome session, could stop support for some working service (like avahi in your case). 
The minimal should be to restart hal : 
sudo /etc/dbus-1/events.d/20hal restart
The best is to simply restart gnome.

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failed to initialize HAL : gdm init script priority should be at least equal to dbus one
https://launchpad.net/bugs/81670