These are standard Ubuntu installs, so screens look a bit different. But install process is the same.
You need / & swap but we normally suggest /home as a separate partition. With any second drive or external or flash drive you want to be sure to install the grub2 boot loader to the MBR of the external device. All the default installs will put grub's boot loader in sda which usually is the internal drive. That can be fixed but better not to have to.
You only get the choice on where to install the boot loader with manual install with Ubuntu, not sure about Backtrack. With Ubuntu it is the combo box at the bottom of the partitioning screen. It also will default to the drive that is sda, so you must change to the drive that is the external.
Install to external drive 11.04. Also any second drive.
Installer version has not changed much so still a good guide except I do not recommend the separate /boot for most systems. Older systems may need it. And some with very large / (root) partitions. BIOS/MBR not for UEFI
http://www.linuxbsdos.com/2012/07/23...hard-drives/2/
Installing Ubuntu in Hard Disk Two (or more) internal or external Lots of detail - now alternative (text based) installer
Maverick screens shown, other versions have slight difference in screens but process is the same.
http://members.iinet.net.au/~herman546/p24.html
p24/041.png Shows combo box to select where to install the grub2 boot loader.
Where Do You Want To Install GNU/GRUB boot loader?
http://members.iinet.net.au/~herman546/p24/041.png
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