Ubuntu On USB Flashdisk

Here the step of USB Flashdisk Ubuntu installation tutorial:

1. Download the Ubuntu ISO and burn it to a CD. You can get it here.
2. Reboot your computer into Ubuntu from the Live CD
3. Insert a 1GB or larger USB flash drive
4. Open a terminal window and type sudo su
5. Type fdisk -l to list available drives/partitions. Note which device is your flash drive (example: /dev/sda) Throughout this tutorial, replace x with your flash drive letter. For example, if your flash drive is sdb, replace x with b.
* type umount /dev/sdx1
* type fdisk /dev/sdx
* type p to show the existing partition and d to delete it
* type p again to show any remaining partitions (if partitions exist, repeat step 3)
* type n to make a new partition
* type p for primary partition
* type 1 to make this the first partition
* hit enter to use the default 1st cylinder
* type +700M to set the partition size
* type a to make this partition active
* type 1 to select partition 1
* type t to change the partition filesystem
* type 6 to select the fat16 file system
* type n to make another new partition
* type p for primary partition
* type 2 to make this the second partition
* hit enter to use the default cylinder
* hit enter again to use the default last cylinder
* type w to write the new partition table

6. Type umount /dev/sdx1 to ensure the 1st partition is unmounted
7. Type mkfs.vfat -F 16 -n usb /dev/sdx1 to format the first partition
8. Type umount /dev/sdx2 to ensure the 2nd partition is unmounted
9. Type mkfs.ext2 -b 4096 -L casper-rw /dev/sdx2 to format the second partition
10. Remove and Re-insert your flash drive
11. Back at the terminal, type sudo apt-get install syslinux mtools
12. Type syslinux -sf /dev/sdx1
13. Download this custom usyslinux.tar file using the archive manager and extract the syslinux.cfg file to your “USB” stick
14. Type cd /cdrom
15. Type cp -rf casper disctree dists install pics pool preseed .disk isolinux/* md5sum.txt README.diskdefines ubuntu.ico casper/vmlinuz casper/initrd.gz install/mt86plus /media/usb/
16. Reboot your computer and set your system BIOS to boot from USB-HDD or USB-ZIP. Also set the boot priority if necessary.

If everything has gone as it should, you should now be able to boot Ubuntu from the USB flash device and it should save your changes, restoring them on boot.

Notes:
If your having trouble getting Ubuntu to boot, your memory stick may have a corrupted mbr. To repair the mbr of your USB device, at the terminal type sudo apt-get install lilo then type lilo -M /dev/sdx (replacing x with the letter of your flash device)