/usr/lib/x86_64-linux-gnu/libmatekbd.so is in libmatekbd-dev 1.20.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmatekbd.so.4.2.0
/usr/lib/x86_64-linux-gnu/libmatekbd.so.4.2.0