This is most probably related to the new networkmanager required to run
GNOME3
See https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/791548
There's code to fix this issue, please see
http://bazaar.launchpad.net/~gwibber-committers/gwibber/trunk/revision/991
or this other link for a raw .diff
http://bazaar.launchpad.net/~gwibber-committers/gwibber/trunk/diff/991
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