/usr/lib/x86_64-linux-gnu/libmate-slab.so.0 is in libmate-slab0 1.8.3+dfsg1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmate-slab.so.0.0.0
/usr/lib/x86_64-linux-gnu/libmate-slab.so.0.0.0