how I can make boot from USB?

Hello George,

you need

a, your ubuntu live CD
b. a USB Stick with 1024 MByte
c. your PC must be able to boot from a stick (maybe check your bios)
d. run your ubuntu live CD

1. insert your stick
2. open a terminal
3. check the device name (for your stick) enter sudo fdisk -l in the terminal
    is really import that you identifies your stick (something like /dev/sda or /dev/sdb
4. enter sudo umount /dev/...your device1
5. enter sudo fdisk /dev/...your device
6. delete all partitions on your stick
7. create two new partitions (one with round about 700 MByte - for the ISO files, and a second with the rest space)
    after the start of fdisk select the number of the partition by pressing "d", create a new partition by pressing "n", enter "p" for a
    primarily partition and "1" for the first partition, enter "1" again to start your partition with the first cylinder, with "+750"
    knows fdisk the size of your partition, enter "a" to select a bootable partition, enter "t" to change the type of your partition,
    enter "6" for FAT16. Now the second partition enter "n" for a new one, "p" for primarily partition, "2" for 2. partition, press
    "Enter" to take the shown values, fdisk should build your second partition with the maximum size
8. now we format your first partition with a FAT16 filesystem and the name "ubuntuusb" enter:
    sudo mkfs.fat -F 16 -n ubuntuusb /dev/...your device1
9. now the second partition with a ext2 filesystem, Blocksize=4096 Byte, and the name ubuntulive enter:
    sudo mkfs.ext2 -b 4096 -L ubuntulive /dev/...your device2
10. mount your stick with sudo mount /dev/...your device1 /tmp/ubunutusb
11. change to your live CD with cd /media/cdrom (please check the correct name on your systen)
12. copy all necessary files to your stick with:
      sudo cp -rf ubuntu-live disctree dists install pics pool pressed .disk iso linux/* md5sum.txt README.diskdefines ubuntu.ico
      ubuntu-live/vmlinuz ubuntu-live/initrd.gz install/mt86plus /media/ubuntuusb
13. now change to your first usb partition and rename isolinux.cfg to syslinux.cfg by enter:
      cd /tmp/ubuntuusb
      sudo mv isolinux.cfg syslinux.cfg
14. now its time to make the stick bootable by installing syslinux und mtools:
      sudo apt-get install syslinux mtools
15. now remove the stick from your directory tree:
      cd
      sudo umount /tmp/ubuntuusb
      sudo syslinux -f /dev/...your device1

if all the stuff above works well you should be able to restart your PC and boot ubuntu from the stick

br
Mathias