Ref: http://www.webupd8.org/2011/03/sublime-text-2-ubuntu-ppa.html
Add our Sublime Text 2 Ubuntu PPA using the following commands:
sudo add-apt-repository ppa:webupd8team/sublime-text-2
sudo apt-get update
Then, install Sublime Text 2 stable build:
sudo apt-get install sublime-text
Or, to install Sublime Text 2 development build, use the following command:
sudo apt-get install sublime-text-dev
For what's new in the latest Sublime Text 2 builds, check out its homepage.