The evergreen.sh is a script which automates the installation of Evergreen for Debian Linux. The install script has been used to install Evergreen in a Vserver instance, a chroot, and a regular Debian Etch installation. I recommend using the script in a chroot before installing Evergreen in your normal Debian environment.
To install Evergreen, execute the following as root:
/bin/sh ./evergreen.sh -v etch -i