You can easily install A2SERVER on Debian or Raspbian Linux by using the A2SERVER install scripts.
While these are the only Linux distributions the scripts have been tested on, other Debian-derived distributions may work as well, such as Ubuntu, provided they don't use kernel 3.12 through 3.15, have AppleTalk networking support available as a kernel module or compiled into the kernel itself, and their repositories contain the packages the scripts require. The user running the scripts needs a bash shell, sudo privileges, and a search path containing all the "bin" and "sbin" directories.
Debian Linux (Tested on Debian 8)
1. Create a new virtual machine (skip if installing on a real machine)
2. Install Debian Linux on the virtual or real machine
Or, if you've got a Raspberry Pi, perform Raspberry Pi setup.
Once you are up and running in Linux, you can execute the automated setup scripts to download, install, and configure the A2SERVER software. To use these, log in to Linux, and type:
wget appleii.ivanx.com/a2server/setup; source setup
Confirm that you want to proceed, enter the password again, and go get a sandwich, but come back so you can answer questions when prompted.
Once it's done, check out the links on the A2SERVER home page for next steps.
If you'd like to set things up manually, or are curious as to what's happening, you can view the contents of the setup scripts.
A2SERVER home page