You've installed python3 packages from a PPA which is preventing the upgrade, as the package versions are greater than those in Trusty, to 14.04.
libpython3.4 3.4.0-2ubuntu1irie1~precise1 1 libpython3.4-minimal 3.4.0-2ubuntu1irie1~precise1 1 libpython3.4-stdlib 3.4.0-2ubuntu1irie1~precise1 1
You've installed python3 packages from a PPA which is preventing the upgrade, as the package versions are greater than those in Trusty, to 14.04.
libpython3.4 3.4.0-2ubuntu1i rie1~precise1 1 4-minimal 3.4.0-2ubuntu1i rie1~precise1 1 rie1~precise1 1
libpython3.
libpython3.4-stdlib 3.4.0-2ubuntu1i