deb http://liveusb.info/multisystem/depot all main
wget -q http://liveusb.info/multisystem/depot/multisystem.asc -O- | sudo apt-key add -
sudo apt-get update
sudo apt-get install multisystem

http://liveusb.info/dotclear/public/img/multisystem/doc-multisystem/documentation.pdf

Official HomePage: http://liveusb.info/dotclear

Multisystem Prerequisites:

• Ubuntu Linux or Ubuntu Based System (can use an Ubuntu CD or USB)
  
• A USB Flash Drive (to use for your MultiBoot USB)
  
• Working Internet Connection
• install-depot-multiboot.sh.tar.bz2

How to Install the Multisystem LiveUSB Tool

Download and Open the Script with Ubuntu's Archive Manager

Extract the install-depot-multiboot.sh Script to your Desktop

Double Click install-depot-multiboot.sh from your desktop and select the option to "Run in Terminal"

How to Use the Multisystem LiveUSB Tool

Insert a USB Drive
Launch the Script via Applications > Accessories > MultiBoot
Select your USB Device from the list and click Validate
Now simply Drag and Drop an ISO into the Window to add the Distribution (repeat the process to add more ISOs)



Once finished, restart your PC, set your boot menu to boot from the USB device, Select the Distro you want to Boot and enjoy!