/usr/lib/x86_64-linux-gnu/libignition-msgs1.so.1 is in libignition-msgs 1.0.0+dfsg1-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libignition-msgs1.so.1.0.0
/usr/lib/x86_64-linux-gnu/libignition-msgs1.so.1.0.0