chroot: failed to run command '/bin/bash': No such file or directory Ubuntu 18.04

Question

I'm following these instructions to make a debian.img in a ubuntu 18.04 on a virtual box build

1. On the PC, create a folder and generate a formatted, mountable image.
2. Install a Debian Buster linux inside the chroot environment with the debootstrap command.
3. Upload this image (debian.img) to your web server to download it later

The link to the site here

mkdir -p webkey/tutorial
cd webkey/tutorial
dd if=/dev/zero of=debian.img bs=1024 count=614400
sudo mkfs.ext2 -F debian.img
sudo tune2fs -c0 debian.img
mkdir debian
sudo mount -o loop debian.img debian/
sudo debootstrap --verbose --foreign --arch armel buster debian http://ftp.de.debian.org/debian
sudo chroot debian
export LC_ALL=C
debootstrap/debootstrap --second-stage

I have done everything upto

sudo chroot debian

When i enter this it gives me

chroot: failed to run command '/bin/bash': No such file or directory

I have read all the posts about chroot and this error none of these solutions does not seem to work for me. Or maybe I am doing something wrong.

Thanks for your time and expertise.