/usr/lib/x86_64-linux-gnu/libgdbm_compat.so is in libgdbm-dev 1.8.3-14.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgdbm_compat.so.3.0.0
/usr/lib/x86_64-linux-gnu/libgdbm_compat.so.3.0.0