No dist upgrade after LinuxMCE has been installed
sudo apt-get dist-upgrade
Note: doing dist-upgrade can break some programs specially once the linuxmce is up and running. I am not expert but that is what i learned from experience. They say you only need to run it once. its up to you.
dist upgrade will most likely destroy your system and you have to start all over again.. even say so in the installation guide.
only update and upgrade, should be enough.
Eypone, those archive errors are known(read a similar thread a few weeks back)
I had the same question as you a while back(me too also started with the beta) and yesterday I went back and checked the versions and they where indeed not the latest. Not even close... at least not compared to what can be found in the beta2 deb that you linked to.
what about those files that is located here? (they to be used or not?)
at least my sources.list _did_ not refer to those