It looks like something installed an older version of the "msgpack- python" pip package in a way that superceded the global pip packages. I was able to fix it with:
pip install --upgrade --user msgpack-python This should probably be closed, then. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1838862 Title: calibre crashes during startup To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/calibre/+bug/1838862/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
