title: Install Linux (lubuntu) from an other then the boot medium
body: <p>I have a big problem to install Lubuntu on an old laptop.
  The thing is, I can boot from CD only and start live mode. That works.
  But I can't install because the CD-Drive is really buggy. I have the same iso on a usb-stick, which I created via Universal-USB-Installer. So question is, how can I start the install from the usb-stick using the lubuntu-live I run from CD?</p>