I got backtrack 5 iso to boot on multiboot grub2 usb drive. I got the info from a backtrack help forum. This trick is to extract the "casper" directory, placing it in the root of the usb drive (not in any other directory).
My menuentry is as follows: menuentry "BackTrack 5 32 bit" { linux /casper/vmlinuz BOOT=casper boot=casper nopersistent rw vga=0x317 -- initrd /casper/initrd.gz } DO NOT use (loop) in the above menu -- it won't work (and there is no loopback). You will boot into a terminal. Then you shout enter "start networking" command (without quotation marks). After this you enter "startx" command and you should be presented with a BackTrack 5 gui environment -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/1329696734.1999.11.camel@localhost.localdomain