I'm using a raspberry pi with a debian wheezy image that included a preinstalled ros indigo. The problem is that I can't install additional packages (e.g. navigation) using apt-get install. I tried to follow these instructions but I always get an error message claiming that the package could not be found when i try to use "sudo apt-get install ros-indigo-navigation".

Could there be a problem with missing/broken packages? Or did I mess up somewhere? Take a look at this Packages has a size of 17K; also ros-indigo-navigation can't be found inside

In comparrison Packages has a size of 2.3M here and ros-indigo-navigation can be found.