/usr/lib/x86_64-linux-gnu/libtag.so.1 is in libtag1v5-vanilla 1.11.1+dfsg.1-0.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libtag.so.1.17.0
/usr/lib/x86_64-linux-gnu/libtag.so.1.17.0