/usr/lib/GNUstep/Libraries is in gnustep-common 2.6.2-2.1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/GNUstep/../../share/GNUstep/Libraries
/usr/lib/GNUstep/../../share/GNUstep/Libraries