As a work-around for those affected, I can confirm that manually applying the upstream patch to `/usr/lib/calibre/calibre/utils/ipc/server.py` does allow Calibre to start up successfully.
As a work-around for those affected, I can confirm that manually applying the upstream patch to `/usr/lib/ calibre/ calibre/ utils/ipc/ server. py` does allow Calibre to start up successfully.