Ubuntu LiveUsb Pendrive Persistent Howto
"It is possible to have Ubuntu or Kubuntu on a USB pendrive or USB hard disk drive with persistent mode. This means that you can boot from a USB pendrive and keep customisations such as keyboard layout, numlock, preferences, additional packages saved on the pendrive. This can be done using linux or windows. You will need a USB pendrive of 1 GB or more. This page is written after having tested the instructions on a Peak III 1 GB pendrive. The preparation of the pendrive is explained using 'fdisk' because I had errors with 'gparted' and i could not give the partitions a volume name. I used Ubuntu to make the pendrive. In Kubuntu it is more or less the same. Where you see 'ubuntu' replace it by 'kubuntu'. I will mark the other differences."