I've seen some activity on AtariAge re: wanting a Linux IDE. I've scripted the setup for my first post to work currently under Ubuntu. You can get the script here.
Run the script as follows:
sudo scriptname $USER
The script will install / download everything you need and create a Dasm directory in your home's root (i.e. /home/Paco)
Please let me know if you have any problems with it, and I'll fix it ASAP.