Comment 2 for bug 427863

well, my chroot is run inside qemu userspace emulation and it tries to execute a mono binary, i wonder if either influences this.

could you try with qemu-arm-static and using the build-arm-chroot to create your chroot env ?
it might not be binfmt itself being at fault but the mono interpreter or the detector ...

ogra@osiris:~$ cat /usr/share/binfmts/cli
package mono-common
detector /usr/lib/cli/binfmt-detector-cli
interpreter /usr/bin/cli
magic MZ