[ubuntu] Mysterious Ubuntu

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http://ubuntuforums.org – Hi All, I am facing a particularly interesting problem. I installed ubuntu 12.04 64 bit on my external HDD (Segate FreeAgent GoFlex 500GB). Installation went fine. I tried to boot it on two machines: 1. HP dv6 6154tx - Boot failed even though I did the installation with this machine. Specs: PROCESSOR Processor Core i5 (2nd Generation) Variant 2430M Chipset Mobile Intel HM65 Express Brand Intel Clock Speed 2.4 GHz With Turbo Boost Upto 3 GHz Cache 3 MB MEMORY Expandable Memory Upto 16 GB Memory Slots 2 (Unused Slot - 1) System Memory 4 GB DDR3 STORAGE Hardware (Hardware)