This seems to be due to some python packages which you've installed from
a PPA.

libpython3.3 3.3.0-1irie1~precise1 1
libpython3.3-minimal 3.3.0-1irie1~precise1 1
libpython3.3-stdlib 3.3.0-1irie1~precise1 1
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

You'll need to install the official package versions of any packages
from that PPA for the upgrade to proceed successfully.

** Changed in: update-manager (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1319017

Title:
  Upgrade from 12.04 to 14.04 failed

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