The Ubuntu Font Family package has just been updated in Ubuntu 11.04 and it now includes 2 new variants - light and medium:
That's not all that's new in the new version: there were also a lot of bugs fixed as well as other slight changes. Check out the full changelog HERE.
As usual, the latest Ubuntu Font Family package is available in our Ubuntu Font Family PPA - add it and install the latest Ubuntu Font Family using the commands below:
sudo add-apt-repository ppa:webupd8team/ubuntu-font-family
sudo apt-get update
sudo apt-get install ttf-ubuntu-font-family