Prerequisites
You'll need to install a recent version of Java (1.5 or later), python 2.6 or later, and the python TkInter package. Additionally, you can speed up toolpath generation by installing the Python "psyco" package.
If you're using Ubuntu or a similar system, you can install all these from the command line:
sudo apt-get install openjdk-6-jdk python python-tk python-psyco
Optional: remove brltty
Some users have had issues with a Braille program that comes pre-installed in Ubuntu and may conflict with the serial driver. If you run into problems, you can remove the program with this command:
sudo apt-get remove brltty
Download
First, make sure you've downloaded the latest version.
Unpack it
Unpack the ReplicatorG .tar.gz file to a folder on your desktop (or wherever you'd like to install it).
Run It!
Open the replicatorg folder and run the "replicatorg" script by double-clicking it.
Done!
Next, move on to the usage page for instructions on configuring and using ReplicatorG.