Dear maintainer,
downgrading a system from bullseye to buster (via apt-pinning) was kind
of impossible (due to removal of libcrypt1.so and unresolved
dependencies of libc-bin and libc6, I think) when I was facing the bug
for the first time and I not being logged in as root within an active
terminal. Copying the content of the extracted
libcrypt1_4.4.15-1_amd64.deb file to its destination helped to get it
fixed.
`cp /libcrypt1_4.4.15-1_amd64/data/usr/lib/x86_64-linux-gnu/.
/usr/lib/x86_64-linux-gnu/`
Regards,
Markus