/usr/lib/libqxt-tulip-4.6.so is in libtulip-dev 4.6.0dfsg-2+b5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libqxt-tulip-4.6.so.0
/usr/lib/libqxt-tulip-4.6.so.0