HELP! Booting Ubuntu off Portable HDD, lots of issues with GRUB

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http://askubuntu.com – I am new to Linux. I recently installed Ubuntu Desktop 11.10 onto my portable hard drive. Much to my surprise, it installed half of GRUB to the PC, and half to the PHDD. The PC does not belong to me. GRUB got removed from the PC, but that's not the issue. I want to be able to boot Ubuntu from my PHDD on any PC. I share one Windows XP PC with my family, but the BIOS is locked and I cannot change the boot order, so I installed PLoP and added it to the Windows boot menu. I don't want to need the boot disc to boot. I just want to be able to have Ubuntu boot when I boot from the external drive. I a (HowTos)