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This basically makes the Live Ubuntu ISO save changes onto your USB drive by using casper-rw loop file for persistently saving and restoring changes on subsequent boots.

Please note: The below installation requires you to use Windows for running the Ubuntu USB 'installation'. Also, you need a USB flash drive of at least 2GB formatted to FAT32.

  1. Download and launch u9.04p.exe. A U904p folder is automatically created
  2. Download the Ubuntu 9.04 ISO and place it in the U904p folder on your computer
  3. From the U904p folder on your PC, click U904.bat and follow the on screen instructions
  4. Once the script has finished, restart your PC and set your BIOS or Boot Menu to boot from the USB device, save your changes and reboot

If all goes well, you should now be booting from your own personal Live Ubuntu 9.04 USB that allows you to save most of your changes persistently.

Persistent size: The default casper-rw loop file that becomes the partition for saving changes is only 1GB. If you have room and would prefer to use more space for saving changes you can download one of the following zip files and extract the new casper-rw file to your USB device, replacing the old one.

You will lose any saved changes by replacing your casper-rw file with one listed above!

Use 7-zip to extract the casper-rw loop file.

[credits: pendrivelinux.com]