>From VarLogDistupgradeMainlog.txt:

2015-10-24 12:04:56,392 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
2015-10-24 12:04:56,392 DEBUG guessing 'ubuntu-gnome-desktop' as missing 
meta-pkg
2015-10-24 12:04:57,216 ERROR failed to mark 'ubuntu-gnome-desktop' for install 
(E:Unable to correct problems, you have held broken packages.)
2015-10-24 12:04:57,324 DEBUG blacklist expr 'update-manager$' matches 
'update-manager'
2015-10-24 12:04:57,324 DEBUG The package 'update-manager' is marked for 
removal but it's in the removal blacklist

Please try installing ubuntu-gnome-desktop before trying to upgrade, and
then try the upgrade process again and see if the matter gets sorted
out.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1509688

Title:
  failed to calculate upgrade

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