/usr/lib/libevocosm.so is in libevocosm-dev 3.1.0-3.1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libevocosm-3.1.so.1.0.0
/usr/lib/libevocosm-3.1.so.1.0.0