Today Ubuntu 12.04 desktop, the latest version, has been released and is available for download here http://www.ubuntu.com/
Ubuntu 12.04 desktop would be great on a tablet machine. If you are a serious desktop computer user, avoid this thing like the plague. It is now designed for newbes, children and savants
One of the dumb things in the install is, there is an active Twitter feed, so the install takes longer. The Twitter feed is redundant info on how great 12.04 is supposed to be.
If you install this version, and when it comes up to the Twitter feed, click on the left arrow in the display window to go back one page, and this will stop the Twitter feed and thus speed up the install.
They have changed the original software that sets the colour scheme, and it sucks big time ! Thus far I haven't found a command window, so I am assuming that it is gone and needs to be installed later.
There are other brands of Linux, RedHat, Gentoo, Debian, that can serve the serious desktop computer user much better.
I am still a big fan of Ubuntu Server, which is only available in command line mode and again only for the serious computer user. If you haven't heard, HP is now installing it on all their server machines for the retail market.