[ubuntu] Unable to boot to external hard drive

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http://ubuntuforums.org – Heya! I am quite new to Linux/UBuntu and has ran into a problem while installing/booting my newly installed Ubuntu 10.04.2.LTS. Up til now I've used a 4 gb flashdrive with a mountable partition of Backtrack 5 as my source for using Linux, and I thought that it was time to take a step further and install the entire Backtrack to disk (Ubuntu 10.04 as I have understood it?). I decided to rezise a partition of my external hard drive and install Backtrack there. The hard drive is a TEAC HD-35PU, 250 gb, with an 12 V powersupply. The installation went smooth, no problems what so ever. However (Hardware)