You might try installing the kubuntu-desktop meta package and then
upgrading again.
2015-12-30 20:34:14,158 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', 'ubuntu-mate-core', 'ubuntu-mate-cloudtop',
'ubuntu-mate-desktop']' meta-pkgs installed
2015-12-30 20:34:14,158 DEBUG guessing 'kubuntu-desktop' as missing meta-pkg
2015-12-30 20:34:15,025 ERROR failed to mark 'kubuntu-desktop' for install
(E:Unable to correct problems, you have held broken packages.)
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1530201
Title:
impossible to upgrade Kubuntu 15.04 to 15.10
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