I have installed Ubuntu 12.04 LTS on my external hard drive and it works fine on the computer it was originally installed from. But when I attempt to boot the external drive from another computer; all I get is black screen with a blinking underscore.
Do I have to install any similar application/service on each computer or to change anything with grub? I already know about the USB live CD but this is a full installation of Ubuntu that I want to boot,
Am I doing anything wrong or is there a possible way to succeed?