This is probably due to a PPA you have enabled and it providing packages
that are greater in version numbering than those available in Trusty.
Try disabling the PPA and downgrading its packages using 'ppa-purge' and
try the upgrade again.
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1408258
Title:
An unresolvable problem occurred while calculating the upgrade.
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