Source: http://www.tokeshi.com/index.php?option=com_content&view=article&id=5017
How to add Linux support to XenServer if you did not choose the Linux option during the install.
This is done from the CLI:
1. Insert CD into host
2. Mount the cd-rom on the host server (the command below is slightly different than the one one found at the source URL above)
Type mount /dev/cdrom /mnt
3. Change directory to the newly created mount point
Type cd /mnt
4. Execute the install script to have the templates installed
Type ./install.sh
5. Change out of the mnt directory
Type cd..
Unmount the cd-rom
Type umount /mnt
6. Eject CD from host
