You seem to be missing an ubuntu meta package.
2015-12-30 04:21:02,963 DEBUG plugins for condition
'from_trustyPostDistUpgradeCache' are '[]'
2015-12-30 04:21:02,963 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
2015-12-30 04:21:02,963 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
2015-12-30 04:21:03,441 ERROR failed to mark 'ubuntu-desktop' for install
(E:Unable to correct problems, you have held broken packages.)
2015-12-30 04:30:05,935 DEBUG blacklist expr 'unity$' matches 'unity'
2015-12-30 04:30:05,935 DEBUG The package 'unity' is marked for removal but
it's in the removal blacklist
2015-12-30 04:32:24,025 ERROR Dist-upgrade failed: 'The package 'unity' is
marked for removal but it is in the removal blacklist.'
2015-12-30 04:32:24,026 DEBUG abort called
Please install the ubuntu-desktop package and try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1530078
Title:
Cannot upgrade from 14.04 to 15.04
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