/usr/lib/GNUstep/ is in gnustep-back0.20-art 0.20.1-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/GNUstep/Bundles/
/usr/lib/GNUstep/Bundles/libgnustep-art-020.bundle/
/usr/lib/GNUstep/Bundles/libgnustep-art-020.bundle/libgnustep-art-020
/usr/lib/GNUstep/Bundles/libgnustep-art-020.bundle/Resources/
/usr/lib/GNUstep/Bundles/libgnustep-art-020.bundle/Resources/English.lproj/
/usr/lib/GNUstep/Bundles/libgnustep-art-020.bundle/Resources/English.lproj/nfontFaceNames.strings
/usr/lib/GNUstep/Bundles/libgnustep-art-020.bundle/Resources/Swedish.lproj/
/usr/lib/GNUstep/Bundles/libgnustep-art-020.bundle/Resources/Swedish.lproj/nfontFaceNames.strings
/usr/lib/GNUstep/Bundles/libgnustep-art-020.bundle/Resources/Info-gnustep.plist
/usr/lib/GNUstep/Bundles/libgnustep-art-020.bundle/stamp.make
/usr/lib/GNUstep/Bundles/libgnustep-art-020.bundle/libgnustep-back-020