Hi,
I hadn't launched anki since long and hence got stuck.
Looking at the trace I see:
self.focusProxy().installEventFilter(self)
and an attribute error that NoneType has no installEventFilter, so it's
quite clear what the problem is:
self.focusProxy() returns None!
That might mean that some versions of PyQT were having a default focus
proxy and that line worked, but newer versions need an explicit setup.
Commenting the line makes it possible to go further, with a few error
windows showing up.
I would suggest asking around.
jpuydt on irc.debian.org