Comment 4 for bug 1912605

# Note: The following can even be done in a LXD container

apt install qemu binfmt-support qemu-user-static debootstrap schroot
sudo qemu-debootstrap --arch=arm64 focal arm64-ubuntu
sudo qemu-debootstrap --arch=s390x focal s390x-ubuntu

echo "[arm64-ubuntu]
description=Test G (arm64)
directory=$(pwd)/arm64-ubuntu
root-users=$(whoami)
users=$(whoami)
type=directory" | sudo tee /etc/schroot/chroot.d/arm64-ubuntu

echo "[s390x-ubuntu]
description=Test G (s390x)
directory=$(pwd)/s390x-ubuntu
root-users=$(whoami)
users=$(whoami)
type=directory" | sudo tee /etc/schroot/chroot.d/s390x-ubuntu

# The creation of the above has run qemu*static a lot already.
# But one can even play around, so far all has been working for me

$ schroot -c arm64-ubuntu
$ md5sum /dev/urandom

$ schroot -c arm64-ubuntu
$ md5sum /dev/urandom

And on the host we see how that actually runs:

root@g:~# ps axlf | grep static | grep -e s390x -e aar
4 0 103720 103588 20 0 226524 13568 do_wai Sl pts/1 0:00 \_ /usr/bin/qemu-aarch64-static /bin/bash
0 0 103748 103720 20 0 224124 7652 - Rl+ pts/1 0:20 \_ /usr/bin/qemu-aarch64-static /usr/bin/md5sum /dev/urandom
4 0 103566 103425 20 0 225508 13784 do_wai Sl pts/0 0:00 \_ /usr/bin/qemu-s390x-static /bin/bash
0 0 103751 103566 20 0 223280 7236 - Rl+ pts/0 0:19 \_ /usr/bin/qemu-s390x-static /usr/bin/md5sum /dev/urandom