/usr/lib/x86_64-linux-gnu/libmatekbdui.so.4 is in libmatekbd4 1.7.1.is.1.6.2-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmatekbdui.so.4.2.0
/usr/lib/x86_64-linux-gnu/libmatekbdui.so.4.2.0