How do I use commands (I'm doing everything on Ubuntu) to create a bootable usb that displays a grub menu automatically when booted from, on that grub menu lists some boot images (downloaded from http://mirror.pnl.gov/releases/14.10/), and upon the user selecting one of them, it is booted from.
From my attempts of installing grub on to a flash drive, then trying to boot from it on another computer, no operating system is recognized. Sometimes there aren't even files on it! (such as when I tried to use grub-install /dev/sdb)
Could someone please tell me how to do what I mentioned earlier? I need the usb stick to install Ubuntu on some computers, and possibly use some other Linux distributions later on.
Thanks in advance!