Author here. That error means you're using binfmt_misc. You can fix that by saying: sudo sh -c "echo ':APE:M::MZqFpD::/bin/sh:' >/proc/sys/fs/binfmt_misc/r

Author here. That error means you're using binfmt_misc. You can fix that by saying: sudo sh -c "echo ':APE:M::MZqFpD::/bin/sh:' >/proc/sys/fs/binfmt_misc/register" Then you're good to go!