The problem is the blender PPA you have enabled. It provides python
packages greater than the ones in Trusty and the release upgrader will
not downgrade packages.
libpython3.4 3.4.0-2ubuntu1irie1~quantal1 0
libpython3.4-minimal 3.4.0-2ubuntu1irie1~quantal1 1
libpython3.4-stdlib 3.4.0-2ubuntu1irie1~quantal1 1
You'll need to use the ppa-purge tool to remove the blender PPA.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1365076
Title:
do-release-upgrade fails from 13.10
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