Update: An updated version of these instructions for Ubuntu 12.04 LTS (Precise Pangolin) is available here.

These instructions are for installing the standalone version of Aptana Studio 3.

1. Install Sun Java – Aptana Studio doesn’t currently work with OpenJDK:

sudo add-apt-repository ppa:ferramroberto/java
sudo apt-get update
sudo apt-get install sun-java6-jdk sun-java6-plugin

2. Download & install xulrunner – Ubuntu 11.10 doesn’t include xulrunner so it must be downloaded.

If you are using Ubuntu 64 bit use:

wget -O xulrunner.deb http://launchpadlibrarian.net/70321329/xulrunner-1.9.2_1.9.2.17%2Bbuild3%2Bnobinonly-0ubuntu1_amd64.deb
sudo dpkg -i xulrunner.deb

If you are using Ubuntu 32 bit use:

wget -O xulrunner.deb http://launchpadlibrarian.net/70321863/xulrunner-1.9.2_1.9.2.17%2Bbuild3%2Bnobinonly-0ubuntu1_i386.deb
sudo dpkg -i xulrunner.deb

3. Download the Standalone version of Aptana Studio 3 from the Aptana Studio website.

4. Unzip it to /opt/aptana-studio-3:

sudo unzip [name of Aptana Studio ZIP file here].zip -d /opt
sudo mv /opt/Aptana Studio 3 /opt/aptana-studio-3

5. Install the menu item:

wget http://www.samclarke.com/wp-content/uploads/2011/11/AptanaStudio.desktop
sudo mv AptanaStudio.desktop /usr/share/applications/AptanaStudio.desktop

That’s it, Aptana Studio 3 should now be installed and ready to use. You may need to log out and back in it to show in the menu.