It looks like you have a version of libdvdnav4 from a PPA or other
location (not the one from the official Ubuntu archive) and that is
blocking the calculation of the upgrade from Trusty to Xenial. You'll
need to use ppapurge to remove that package and the upgrade should be
calculable. Thanks and good luck!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
** Summary changed:
- Unable to upgrade
+ Unable to upgrade due to libdvdnav4 package
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https://bugs.launchpad.net/bugs/1631639
Title:
Unable to upgrade due to libdvdnav4 package
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