I'd like to report that this is the possible cause of my system being unbootable at the moment.
I run Ubuntu Focal on a Dell laptop and run regular `dist-upgrade`s. The latest one seems to have triggered the corner case described above. Booting fails to get to my desktop. Ubuntu's recovery mode gets to the menu where "dpkg" and "root shell" are options. Choosing the former, I see log messages about lib6 configuration failing because perl cannot load because of libcrypt.so. This is why I suspect this bug as the root cause. The root shell also fails to start but the logs disappear too quickly. I'll attempt to recover with a live cd and can post updates here if that's useful. Thank you!
