You can also try my ubuntu repository: https://launchpad.net/~mmk2410/+archive/ubuntu/intellij-idea
To use it just run the following commands:
sudo apt-add-repository ppa:mmk2410/intellij-idea
sudo apt-get update
The community edition can then installed with
sudo apt-get install intellij-idea-community
and the ultimate edition with
sudo apt-get install intellij-idea-ultimate