*** This bug is a duplicate of bug 1308338 ***
https://bugs.launchpad.net/bugs/1308338
** This bug has been marked a duplicate of bug 1436167
upgrade from 12.04 to 14.04 failed
** This bug is no longer a duplicate of bug 1436167
upgrade from 12.04 to 14.04 failed
** 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/1436171
Title:
Calculating the changes 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 If none of this applies,
then please report this bug using the command 'ubuntu-bug ubuntu-
release-upgrader-core' in a terminal.
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