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I'm making a bootable USB key for myself, and one function of it is to install Ubuntu.

I have downloaded the ubuntu-11.10-desktop-i386.iso file.

There is a pretty good method for installation of Red Hat from a USB drive, but the problem is, when it comes to Ubuntu, what should the syslinux.cfg file be?

I used syslinux -d /boot/syslinux /dev/sdb1 and put vmlinuz and initrd.img inside it.

Is the following item of syslinux.cfg correct?

LABEL InstallUbuntu
MENU LABEL Ubuntu 11.10 Install
KERNEL /boot/syslinux/vmlinuz
APPEND linux load_ramdisk=1 initrd=/boot/syslinux/initrd.img method=hd:sdb1:/
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If you boot Ubuntu select "Try Ubuntu"

Open a terminal and run usb-creator-gtk, Ubuntu will copy itself to your USB with a complete syslinux install.

Ubuntu boots from the /casper/vmlinux

If you just wanted to edit an existing syslinux.cfg
These are the relevant lines Ubuntu uses after following the above procedure 

kernel /casper/vmlinuz
append noprompt boot=casper integrity-check initrd=/casper/initrd.lz quiet splash --
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  • Thanks for your answer, but I what I mean is that the bootable usb key is also a installer for ubuntu. I have found the solution, see syslinux.org/archives/2011-January/015991.html – NGY Jan 22 '12 at 18:03
  • This is the installer. If you follow the usb-creator the menu has all options but an "Install Ubuntu" icon is always on the desktop regardless. There are many ways to slice and dice this one. – bsd Jan 22 '12 at 21:31
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LABEL InstallUbuntu
MENU LABEL Ubuntu 11.10 Install
LINUX /vmlinuz
INITRD /initrd.lz
APPEND boot=casper iso-scan/filename=/ubuntu-11.10-desktop-i386.iso

solved the problem.

See also there.

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