Please try installing one of the mentioned ubuntu metapackages.
2016-01-01 10:11:27,589 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
2016-01-01 10:11:27,589 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
After installing the one you want, try the upgrade again. Thanks!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1530428
Title:
Gtk-CRITICAL **: IA__gtk_clipboard_set_with_data: assertion 'targets
!= NULL' failed
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