It's possible to boot Ubuntu 10.04 from the ISO using grub 2 ! You can do this with the current beta versions too. I've tested with Ubuntu 10.04 Beta 1 ISO.
I found out how to do this from this awesome guide for GRUB: http://members.iinet.net/~herman546/p20.html The page for booting ISO's using grub is here: http://members.iinet.net/~herman546/p20/GRUB2%20Configuration%20File%20Commands.html#Loopback_Boot_Entry This can only be used for distros that actually support this feature. I guess Knoppix would work with this. You'll have to add the following to your /boot/grub/grub.cfg file.Add it just before the line containing "### END /etc/grub.d/10_linux ###" echo "Adding Ubuntu 10.04 Beta1 ISO boot entry" >&2 cat << EOF menuentry "Ubuntu 10.04 Beta1 ISO" { loopback loop (hdx,x)/path_to_iso linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=path_to_iso noprompt noeject quiet splash initrd (loop)/casper/initrd.lz } The x in (hdx,x) must be replaced by the appropriate numbers. It refers to a disk partition. For example on my system /dev/sda3 is my Ubuntu partition and it is (hd0,3). path_to_iso must be replaced by the path to the iso file. For example if the ISO is stored in your Downloads folder the loopback and linux lines would be: loopback loop (hd0,3)/home/username/Downloads/ubuntu-10.04-beta1-desktop-i386.iso linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=/home/username/Downloads/ubuntu-10.04-beta1-desktop-i386.iso noprompt noeject quiet splash It works faster than booting from a CD. You can check out the new theme and the change in the minimize,maximize,exit buttons which have been placed on the left. A bit annoying for me since I tend to move the mouse to the right whenever I want to use those. Gimp has been removed and the Pitivi video editor is now included. Have fun! Please tell me if there any errors here and correct them if you can.
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