This might have some to do with the fact that you have no desktop
metapackage installed.
2014-12-21 17:09:36,207 DEBUG none of the '['ubuntu-desktop',
'kubuntu-desktop', 'xubuntu-desktop', 'ubuntustudio-desktop',
'mythbuntu-desktop', 'kubuntu-netbook', 'lubuntu-desktop']' meta-pkgs installed
2014-12-21 17:09:36,207 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
Please try installing the one of your preference and then trying the
upgrade again. Thanks!
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1404660
Title:
update from 12.04 to 14.04 via upgrade-manager -d called Ubuntu
Desktop install fail message
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