In VarLogDistupgradeMainlog.txt we can see the following:
2017-09-06 06:36:06,867 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', 'ubuntukylin-desktop']' meta-pkgs installed
2017-09-06 06:36:06,867 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
Please try manually reinstalling 'ubuntu-desktop', since you are using
the Unity desktop, and then try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1715378
Title:
Upgrade from 16.06 to 17.04 was unable to upgrade unity-desktop
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