/usr/lib/x86_64-linux-gnu/libCoin.so.80 is in libcoin80 3.1.4~abc9f50-4ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libCoin.so.80.0.0
/usr/lib/x86_64-linux-gnu/libCoin.so.80.0.0