*** 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/1355887
Title:
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
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