/usr/lib/x86_64-linux-gnu/libt4k_common.so is in libt4k-common0-dev 0.1.1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libt4k_common.so.0.0.0
/usr/lib/x86_64-linux-gnu/libt4k_common.so.0.0.0