/usr/lib/x86_64-linux-gnu/libapt-inst.so.1.4 is in libapt-inst1.4 0.8.16~exp12ubuntu10.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libapt-inst.so.1.4.0
/usr/lib/x86_64-linux-gnu/libapt-inst.so.1.4.0