You seem to have installed a version of a package which is not the one
from the official Ubuntu archive.
>From your VarLogDistUpgradeAptlog.txt file:
Investigating (9) libdvdnav4 [ i386 ] < 5.0.3-1~trusty -> 5.0.3-1 > (
universe/libs )
The official version for trusty is 5.0.3-1. You might try reinstalling
the official one and see if that resolves the upgrade for you.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1750723
Title:
Unable to Upgrade to 16.??
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