Rebooted my laptop and the same thing happened. Long wait, no progress bar. Switched to the console after a while and found a prompt there asking me for the passphrase to decrypt my disk. I was confused. Checking the basics: sudo apt update. Nothing. sudo apt upgrade. "dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem." Ugh!? Did that, will reboot again and see whether that fixes my problem.
Doing that while listening to AGNUS DEI, Sacral Choral Music.