Please install the ubuntu-desktop meta package and try the upgrade
again.
64 2016-01-08 12:22:31,840 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
65 2016-01-08 12:22:31,841 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
66 2016-01-08 12:22:32,334 ERROR failed to mark 'ubuntu-desktop' for install
(E:Probleme können nicht korrigiert werden, Sie haben zurückgehaltene defekte
Pakete. )
67 2016-01-08 12:22:45,898 DEBUG blacklist expr 'unity$' matches 'unity'
68 2016-01-08 12:22:45,898 DEBUG The package 'unity' is marked for removal but
it's in the removal blacklist
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1532166
Title:
can not upgrade from 14.04 to 15.04
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