Xubuntu 12.04: don't fix what is not broken
Canonical’s flagship is Ubuntu. The recent version of Ubuntu 12.04 Precise Pangolin was released on the 26th of April 2012. But Ubuntu 12.04 is not the only operating system from Canonical. The company also officially supports three other Ubuntu-based OSes: Kubuntu, Xubuntu and Lubuntu. These systems have different desktop environments: KDE, Xfce and LXDE respectively. There are also the less widespread variants Edubuntu and Myth-buntu, but they are targeted to specific markets, rather than to the general public.
Xubuntu 12.04 LTS (long-term support) was released on the very same day as Ubuntu 12.04. The disk image size for Xubuntu 12.04 is slightly less than Ubuntu's. It is only 680 Mb. I downloaded it through torrent, and there were no issues with this process.
So, the CD with Xubuntu 12.04 is ready and inserted into the drive of my Fujitsu-Siemens Amilo Pi 1505 laptop. Reboot. Choose to boot from CD.