I think you have taken a step in the right direction, but the problem is still lurking there somewhere. It does not surprise me that you upgraded from a previous version. Whilst mostly trouble free, such upgrades can be problematic to the extent that sometimes a distro will recommend a reinstall for certain upgrades. I think we are likely at the point where a reinstall is preferable to trying to find the problem.
My only ideas short of this at the moment? Is there a package with specific Python bindings for QT? If so, is this installed and for QT5. Also, I recall apt-get has a dist-upgrade or dist-upgrade option that can be run from the command line which may be worth a try.
It seems to me, however, that your best option is a complete reinstall, but preserving and if necessary restoring your home directory. dpkg actually facilitates this by letting you produce a list of packages which you can feed to apt-get to install automatically on your new version.
Keep a good backup.
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