install Ubuntu12.04 with ISO file using grub in usb disk

Question

download the latest vmlinuz and initrd from

http://archive.ubuntu.com/ubuntu/dists/precise/main/installer-amd64/current/images/hd-media/

I put the ubuntu-12.04.1-server-amd64.iso to the /software (in my usb disk)

and put the vmlinuz and the initrd files to the / (in my usb disk)

the menu.lst for grub:

title Install UBUNTU SERVER 12.04 64BIT
root
kernel /vmlinuz boot=install iso-scan/filename=/software/ubuntu-12.04.1-server-amd64.iso ro quiet
initrd /initrd.gz

I have install ubuntu server 11.10 successfully with grub for dos,but in ubuntu server 12.04, there are some wrongs:

I have boot it,and choose the language,when I click "next", it was detecting devices, then got a wrong: Can't find any ISO file to install

Answer 1

grub4dos

This used to work for grub4dos (e.g. hiren's boot cd):

title Ubuntu server 12.04.1 (GNOME 64-bit)
find --set-root /ubuntu-12.04.1-server-amd64.iso
map /ubuntu-12.04.1-server-amd64.iso (0xff)
map --hook
root (0xff)
kernel /install/vmlinuz  file=/cdrom/preseed/ubuntu-server.seed quiet --
initrd /install/initrd.gz

Note that this method is not for grub2. Kernel line has been found in the .iso archive (boot/grub/grub.cfg)

grub2

Follow the instructions from here: https://help.ubuntu.com/community/Grub2/ISOBoot

liveusb

An alternative solution: You may easily create a live ubuntu usb using the programs:

• Startup disk creator (included in ubuntu desktop)
• LiLi (windows only): http://www.linuxliveusb.com/
• Universal usb installer (windows and linux): http://www.ubuntu.com/download/help/create-a-usb-stick-on-windows