only apt-get update and apt-get dist-upgrade
if you do apt-get upgrade you will upgrade to kubuntu 9.10
apt-get upgrade will NOT upgrade to 9.10.
apt-get update will update the list of packages from all repositories
apt-get upgrade will upgrade any existing installed packages.
apt-get dist-upgrade will upgrade any existing packages and install any new required packages.
Under normal circumstances you should perform apt-get update and apt-get upgrade. Performing an apt-get dist-upgrade can *sometimes* install packages which will conflict with LMCE and cause things to break. There are completely seperate commands used to upgrade to 9.10.