/usr/lib/libcalligrakdgantt.so.13 is in calligraplan 1:2.8.1-1-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libcalligrakdgantt.so.13.0.0
/usr/lib/libcalligrakdgantt.so.13.0.0