https://help.ubuntu.com/community/LiveCDCustomization?highlight=(LiveCDCustomization)
http://forum.ubuntu-fr.org/viewtopic.php?id=60177
https://wiki.ubuntu.com/LiveUsbPendrivePersistent
https://help.ubuntu.com/community/Installation/FromUSBStick
initrd
http://www.linuxforums.org/forum/linux-kernel/82174-extracting-initrd-image.html