UbuntuHelp:UbuntuServerFlashDriveInstaller

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https://help.ubuntu.com/community/UbuntuServerFlashDriveInstaller

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This pages describes how to create a flash drive that can be used for installing Ubuntu Server. This is for any machine that doesn't have a CD drive but can boot from USB media (i.e. the flash drive). Note: This method may work with other iso files besides the Ubuntu Server iso file. The steps are:

• Log onto a Ubuntu machine where you have sudo priveleges
• Download the hd-media installer's initrd.gz file
• Download the hd-media installer's vmlinuz file
• Note: These links are version dependant, if you are not installing hardy, you'll need to get the vmlinuz and initrd.gz for your own version (i.e. intrepid, jaunty, etc).
• vmlinuz: http://archive.ubuntu.com/ubuntu/dists/<YOUR_VERSION>/main/installer-i386/current/images/hd-media/vmlinuz
• initrd.gz: http://archive.ubuntu.com/ubuntu/dists/<YOUR_VERSION>/main/installer-i386/current/images/hd-media/initrd.gz
• Download Ubuntu Server installation iso file
• Determine which device your flash drive is on (/dev/sdb, etc)
• Run the script below after:
• Making sure you are in the same directory that contains the three files that were just downloaded
• Replacing /dev/sdx with /dev/[your device here]
• Changing the ISOIMAGE variable to match the Ubuntu Server iso filename
• Boot the computer you would like to install Ubuntu Server on from the flash drive
• Install Ubuntu Server as you would from a normal install CD
• Note: The first screen after the language prompt has several options. Only the first option works (Install to disk)

Comment: Could not get it to work with hardy server iso - it fails to mount /dev/sda and /var/log/syslog says Debian image ubuntu-8.10-server-amd64.iso is not usable :( Notes:

• The links above are for the 32-bit version of Ubuntu 8.04 (Hardy). To install with a 64-bit image, replace the "i386" in the URLs with a "amd64". To install Ubuntu 8.10 (Intrepid), replace "hardy" in the URLs with "intrepid".
• If on booting the USB drive you get a blank screen with the cryptic message MBR FA:, press the "a" key. The message will change to MBR 1234F. Now press "1" and the boot will proceed as normal.
• Depending on the speed of your drive, the "Loading Linux Kernel" window may show 100% for a minute or more. It hasn't locked up. Just be patient!

Flash Drive Creation Script

# Replace "sdx" with "sdb" or whatever your flash drive is
#   - If unsure which device is your flash drive then
#     run "sudo fdisk -l | less" in order to identify it

ISOIMAGE=ubuntu-8.04-server-i386.iso

sudo apt-get install syslinux mtools mbr
echo "Use fdisk to manually create a 1GB bootable FAT16 partition."
read -p "Press [Enter] to start the fdisk program..."
sudo fdisk /dev/sdx
sudo mkfs -t vfat /dev/sdx1
sudo mkdir -p /mnt/flash
sudo mount -t vfat /dev/sdx1 /mnt/flash
sudo syslinux -s /dev/sdx1
sudo mkdir -p /mnt/iso
sudo mount -o loop $ISOIMAGE /mnt/iso
sudo cp -R /mnt/iso/isolinux/* /mnt/flash
sudo mv /mnt/flash/isolinux.cfg /mnt/flash/syslinux.cfg
sudo mkdir -p /mnt/flash/install
sudo cp vmlinuz /mnt/flash/install
sudo cp initrd.gz /mnt/flash/install
sudo cp $ISOIMAGE /mnt/flash
sudo install-mbr /dev/sdx
sudo umount /mnt/flash
sudo umount /mnt/iso