so I tried to use my new toy, the sensorian board, with the image they provide, but aptitude did not want to work. It tried to connect to
192.168.137.3:3128 instead of
mirrordirector.raspbian.org like it should because of the
/etc/apt/sources.list. The solution was to remove the proxy that is configured in
/etc/apt/apt.conf. The easiest way to do this is to run:
sudo mv /etc/apt/apt.conf /etc/apt/apt.conf.old
sudo aptitude update
I hope this helps somebody.