>From VarLogDistupgradeMainlog.txt:

2015-12-21 23:11:07,384 DEBUG none of the '['ubuntu-desktop', 
'kubuntu-desktop', 'xubuntu-core', 'xubuntu-desktop', 'ubuntustudio-desktop', 
'mythbuntu-desktop', 'kubuntu-netbook', 'lubuntu-core', 'lubuntu-desktop', 
'ubuntu-gnome-desktop']' meta-pkgs installed
2015-12-21 23:11:07,384 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
2015-12-21 23:11:13,935 ERROR failed to mark 'ubuntu-desktop' for install 
(E:Unable to correct problems, you have held broken packages.)

If you manually install ubuntu-desktop the upgrade will probably go
better.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1528429

Title:
  cant upgrade from 14.04 to 15.04

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