This is affecting other parts of Ubuntu, as we don't always install python2 anymore after porting all the default apps to python3. The lack of python3 launchpadlib means apport (the automatic bug reporting tool) doesn't work on some installations.
edit: porting launchpadlib requires first porting lazr.restfulclient, which might be genuinely challenging: https://bugs.launchpad.net/lazr.restfulclient/+bug/1000801