After saving a few months, finally accomplished also to be able to buy a USB Flashdisk size 16GB. The main purpose I bought a large enough size flash, is to make it as a booting of various OS, or commonly referred to as multiboot.
To make multiboot in 1 piece of USB flashdisk in Ubuntu, we can use Multisystem application. For Multisystem installation in Ubuntu, here's how:
Download the installer file first here
Open and extract the install-depot-multisystem.sh.tar.bz2 file you just downloaded until you get a file called install-depot-multisystem.sh.
Give the executable rights and run the file:
chmod +x /locationofthefile/install-depot-multisystem.sh ./locationofthefile/install-depot-multisystem.sh
If prompted to enter a password, just fill in your password. Then wait until the multisystem installation process is complete.
Finish