see also Bug #56627 , Bug #66376 Googling I saw quite some people hitting this issue
This is a real duplicate of Bug #66376 -- "can't find DistUpgradeViewGtk" when upgrading dapper->edgy https://launchpad.net/bugs/67999 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
