/usr/lib/x86_64-linux-gnu/libcalligrasheetscommon.so.15 is in calligrasheets 1:3.0.1-0ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcalligrasheetscommon.so.15.0.0