/usr/lib/x86_64-linux-gnu/libarchive.so is in libarchive-dev 3.1.2-7ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libarchive.so.13.1.2
/usr/lib/x86_64-linux-gnu/libarchive.so.13.1.2