CA Installer is the best and easiest way to install CA and stay up-to-date under Linux.

Installation

Ubuntu

CA Installer is included in the Spring Ubuntu repository. The package name is "ca-installer".

The repository address is

deb http://ppa.launchpad.net/spring/ubuntu intrepid main
deb-src http://ppa.launchpad.net/spring/ubuntu intrepid main

To install

sudo aptitude update
sudo aptitude install ca-installer

Once installed, you will have a menu entry under Applications->Games->CA Installer.
Please refer to  http://spring.clan-sy.com/wiki/Ubuntu_install, if you need more detailed directions on enabling this repository.

Screenshots