*** This bug is a duplicate of bug 1308338 ***
https://bugs.launchpad.net/bugs/1308338
** This bug has been marked a duplicate of bug 1308338
Ubuntu 12.04 LTS -> 14.04 LTS upgrade fails if Flight Gear installed
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https://bugs.launchpad.net/bugs/1489036
Title:
upgrade from 12.04 to 14.04 failed 'could not calculate the upgrade.
an unresolvable problem occurred while calculating the upgrade. This
can be caused by: Upgrading to a pre-release version of ubuntu ,
running the current pre-release version of ubuntu, Unofficial software
packages not provided by ubuntu. I do not know which of these apply.
To manage notifications about this bug go to:
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