I'm a very raw n00b wrt Debian and Raspberry Pi. I got the impression that I could use aptitude to upgrade a Debian wheezy system to Raspbian wheezy (is that right?) by changing the content of the /etc/apt/sources.list file to that used by the Raspbian image. This doesn't work for me - something about not finding a bunch of armel packages. Am I totally off track? Is there some other way to do this? Thanks.