Provided you have already installed debootstrap, you can use the following command to create a small [Ubuntu 20.04 (Focal Fossa)](https://releases.ubuntu.com/focal/) root file system for an amd64 compatible processor in the folder /mnt:

```debootstrap --variant=minbase --arch=amd64 focal /mnt http://archive.ubuntu.com/ubuntu```

You can find an in-depth explanation of all possible arguments in the [corresponding man page](https://manpages.ubuntu.com/manpages/trusty/man8/debootstrap.8.html).
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