Have you pinned or marked some packages as protected? (From
VarLogDistupgradeMainlog.txt)

3804 Broken ubuntu-gnome-desktop:amd64 Dipende on gdm3 [ amd64 ] < none -> 
3.18.3-0ubuntu2 > ( universe/gnome )
3805   Considering gdm3:amd64 1 as a solution to ubuntu-gnome-desktop:amd64 0
3806   Ignore MarkKeep of ubuntu-gnome-desktop [ amd64 ] < 0.43 -> 0.58 > ( 
universe/metapackages ) as its mode (Install) is protected


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

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https://bugs.launchpad.net/bugs/1574234

Title:
  unable to upgrade ubuntu

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