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When trying to upgrade to 12.10 from 12.04 running update-manager -d in terminal and I got the following message in the console:

authenticate 'quantal.tar.gz' against 'quantal.tar.gz.gpg' 
extracting 'quantal.tar.gz'
can't load DistUpgradeViewGtk3 (Gtk couldn't be initialized)

Any tip on how to proceed?

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How are you trying to upgrade? –  Warren Hill Apr 27 '13 at 10:14
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