/usr/lib/x86_64-linux-gnu/libapr-1.so is in libapr1-dev 1.5.1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libapr-1.so.0.5.1
/usr/lib/x86_64-linux-gnu/libapr-1.so.0.5.1