Pendrive Ubuntu is a download of the newest Ubuntu and the Unebootin USB installer.A USB boot to the Pendrive and you're even on the Internet.However when you install Ubuntu they require a screen name and password.You'll spend a half hour trying different passwords because the ones you choose are not strong enough.(Try this one 5467890(0-=@#$%6778856hjmrdfbtr45^78@34567esc.) Persistence is the file space bigger than the install.Four gig of persistence means that you can download and hold four gig in your pendrive even after it's unplugged.