[all variants] Problems installing Ubuntu/PinguyOS/Mint to External HDD

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http://ubuntuforums.org – On both my laptop and netbook I was able to get what I wanted. On my Laptop I've managed to get Pinguy OS 12.04 and Linux Mint 13 running in a dual boot and on my Netbook I was able to get Lubuntu 12.04 and Joli Cloud in a dual boot. However, on my desktop I've run into issues. First of all every OS I've tried installing so far does not allow me to install it along side Windows 7 like it has on the laptop and netbook. I decided to stick in a External 1TB HDD I had laying around and install Ubuntu 12.04 on to it. The installation went well then I rebooted and got "error:file not found. gru (Hardware)