>From Mainlog.txt we can see the following:
2016-01-17 16:26:58,897 DEBUG plugins for condition
'from_trustyPostDistUpgradeCache' are '[]'
2016-01-17 16:26:58,898 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
2016-01-17 16:26:58,899 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
2016-01-17 16:27:01,736 ERROR failed to mark 'ubuntu-desktop' for install
(E:Unable to correct problems, you have held broken packages.)
Please try installing one of the supported meta-pkgs and see if the upgrade can
be calculated after that. Thanks in advance.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1535136
Title:
Wouldn't complete Ubuntu 15.04 upgrade from 14.04 LTS.
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