Ubuntu is a user friendly distribution based on debian.
Using debootstrap. See the unified install scripts.
These images are on an ext3 filesystem and use 1GB of disk space when uncompressed.
root_fs (32-bit ~50MB) MD5 SHA
Boot test log
(last updated on the $DATE)
Since Ubuntu is based on debian, keeping it up to date is as simple as running:
apt-get update apt-get upgrade