This failed because you have python3 installed from a PPA.
libpython3.4 3.4.0-2ubuntu1irie1~precise1 0
libpython3.4-minimal 3.4.0-2ubuntu1irie1~precise1 1
libpython3.4-stdlib 3.4.0-2ubuntu1irie1~precise1 1
The version number of python3 from that PPA is greater than the one in
the Trusty release, so the release upgrader fails to calculate the
upgrade.
You'll need to remove that PPA using the tool ppa-purge for the upgrade
to be calculated successfully and complete.
** Changed in: update-manager (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1351625
Title:
Unable to upgrade from 12.04 LTS to 14.04 LTS
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