/usr/lib/x86_64-linux-gnu/libXxf86vm.so is in libxxf86vm-dev 1:1.1.1-2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libXxf86vm.so.1.0.0
/usr/lib/x86_64-linux-gnu/libXxf86vm.so.1.0.0