/usr/lib/x86_64-linux-gnu/libplibpsl.so.1 is in libplib1 1.8.5-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libplibpsl.so.1.8.5
/usr/lib/x86_64-linux-gnu/libplibpsl.so.1.8.5