How to do it...

Now it's time to see how chroot works:

1. Execute an ARM64 bash command by using our x86_64 host, as follows:

$ sudo chroot debian-stretch-arm64/ bash
bash: warning: setlocale: LC_ALL: cannot change locale (en_GB.UTF-8)
root@giometti-VirtualBox:/# 

1. Then, we can use each ARM64 command as we did on the ESPRESSObin; for example, to list files into the current directory; we can use the following:

# ls /
bin  dev  home media  opt   root  sbin  sys  usr
boot etc  lib  mnt    proc  run   srv   tmp  var
# cat /etc/hostname 
espressobin

However, there are some traps; for instance, we completely miss the /proc and /sys directories and programs, which rely on them and will fail for sure:

# ls /{proc,sys}
/proc:

/sys:
# ps
Error: /proc must be mounted
  To mount /proc at boot you need an /etc/fstab line like:
      proc /proc proc defaults
  In the meantime, run "mount proc /proc -t proc"

To resolve these problems, we can manually mount these missing directories before executing chroot, but this is quite annoying due to the fact that they are so many, so we can try using the schroot utility, which, in turn, can do all of these steps for us. Let's see how.