/usr/lib/libkritasketchlib.so.13 is in krita-sketch 1:2.8.5+dfsg-1+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libkritasketchlib.so.13.0.0
/usr/lib/libkritasketchlib.so.13.0.0