The gdk-pixbuf loaders.cache problem is already covered in bug #1282294 In any case it is just a warning that should not block the upgrade.
I assume the clues are in VarLogDistupgradeMainlog.txt : 2015-04-24 21:55:16,256 WARNING no activity on terminal for 300 seconds (Applying changes) 2015-04-24 23:50:50,642 WARNING no activity on terminal for 300 seconds (Configuring libgutenprint2 (amd64)) 2015-04-25 12:13:43,785 WARNING ctrl-c press detected, user decided to pass it on: False 2015-04-25 12:18:55,997 WARNING no activity on terminal for 300 seconds (Configuring libgutenprint2 (amd64)) 2015-04-25 15:18:50,731 WARNING no activity on terminal for 300 seconds (Configuring libgutenprint2 (amd64)) 2015-04-25 19:43:03,290 WARNING no activity on terminal for 300 seconds (Configuring libgutenprint2 (amd64)) 2015-04-26 11:02:22,889 WARNING no activity on terminal for 300 seconds (Configuring libgutenprint2 (amd64)) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1448592 Title: upgrade from 14.10 to 15.04 stuck due to debconf not working? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1448592/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
