I have been using it for more than 2 years on Windows. I recently installed Ubuntu 9.04 Linux on my machine. I tried installing Aptana Studio on Ubuntu but to my surprise, installing Aptana on Ubuntu is not as easy as it is on Windows and Mac. I searched online alot and finally found the solution at http://maketecheasier.com/install-aptana-studio-in-ubuntu-intrepid/2009/03/23
Here are the steps to install it...
1. Download and install all dependencies. Open Terminal and enter this command
sudo apt-get install sun-java6-jre sun-java6-plugin xulrunner
2. Download Aptana for Linux from http://72.3.219.182/studio/download/thanks?platform=standalone&os=linux&ev=3.4
2. Save it in your Home Directory and Unzip it there.
3. Create one executable file. (eg. launchAptana.sh)
4. Write this in that file.
#!/bin/bash
export MOZILLA_FIVE_HOME=/usr/lib/xulrunner
/home/damien/aptana/AptanaStudio #filepath to Aptana folder
Now you can run Aptana Studio by double clicking on that newly created file.