/usr/lib/x86_64-linux-gnu/libtag_c.so is in libtagc0-dev 1.7-1ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libtag_c.so.0
/usr/lib/x86_64-linux-gnu/libtag_c.so.0