/usr/lib/libkdevplatformutil.so.5 is in kdevplatform5-libs 1.3.1-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libkdevplatformutil.so.5.0.0
/usr/lib/libkdevplatformutil.so.5.0.0