/usr/lib/quake3/base/baseq3/qagamex86_64.so is in ioquake3-server 1.36+u20180108~dfsg-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/quake3/base/baseq3/../../../ioquake3/baseq3/qagamex86_64.so