/usr/lib/x86_64-linux-gnu/libfbembed.so is in firebird-dev 2.5.4.26856.ds4-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libfbembed.so.2.5.4
/usr/lib/x86_64-linux-gnu/libfbembed.so.2.5.4