I'm really hoping somebody has something to share. I've tried all the things suggested in this thread and the seemingly related issues I've read through on GitHub. BTW, I'm pretty sure the weird characters just represent progress of RSA key generation, so the issue seems to be that we're getting stuck somewhere just after that.
The Calibre container is the one that I only update when I'm fully prepared to spend hours troubleshooting. I should really just some extra hours to make my own personal Calibre container that I know everything about (and can thus fix)!
