You have two meta packages installed and that is causing the release
upgrade to fail to be calculated.
2016-05-13 12:00:43,019 DEBUG MetaPkgs: kubuntu-desktop ubuntu-desktop
It looks like you are using kubuntu, if that's the case remove ubuntu-
desktop and then run the upgrader again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1581428
Title:
Unable to update Kubuntu 14.04 to 16.06
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