fully installed "ubuntu" matrix from me:
my hdd / others hdd - my key / others key - my virtual / others virtual
Debian 5.0 0/0 - 1/0 - 0/0 = ++++
Ubuntu 9.04 1/1 - 0/1 - 0/0 = +++++
Ubuntu 9.10 0/0 - 0/0 - 0/0 = ++
Ubuntu 10.04 1/0 - 1/0 - 1/0 = +
Ubuntu 10.10 1/0 - 0/0 - 0/0
Ubuntu 11.04 1/0 - 0/0 - 0/0

I use computer from 1993. (M$-DOS 5.0 ...)
I use Linux from 1999. (Suse 6.3, Mandrake 7 ...)

I installed many OSes: mostly Ubuntu, other Linuxs, (OSes from M$)
(If I install Ubuntu -not upgrade- I use the alternate media with unplugged network cable.)
(for minimal installation to usb key the mini iso is the ideal way)

What you understand Ubuntu?
  http://www.youtube.com/watch?v=ODQ4WiDsEBQ (The Ubuntu Experience (Nelson Mandela Interview))

A happy video - When we can delete the whole disk:
  http://www.youtube.com/watch?v=nWIrxuF5NSo (Ubuntu @ the Library)

The desktop:
  http://www.youtube.com/watch?v=E4Fbk52Mk1w (Compiz Fusion: A Quick Demonstration)
  http://www.youtube.com/watch?v=4uNQcD82mhk (Getting Started With Compiz Fusion)
  http://www.youtube.com/watch?v=_ImW0-MgR8I (Compiz Fusion Development)
The desktop ... in hungary:
  http://www.youtube.com/watch?v=A-PyleeV14Y (compiz fusion)
  http://www.youtube.com/watch?v=l4fMJAJy99U (compiz fusion 2)

Ubuntu-Official Ubuntu Documentation:
  https://help.ubuntu.com/
Ubuntu-User Documentation:
  https://help.ubuntu.com/community/

Other links:
  http://releases.ubuntu.com/ , http://cdimage.ubuntu.com/
  https://launchpad.net/~ubuntu-hu , https://launchpad.net/~hungarian
  http://ubuntu.hu/ , http://hup.hu/