Sorry missed that final screenshot. Believe it or not those complaints about missing keys are only warnings and can be ignored. So it looks like you can update from the repositories OK, but you still can't install wget? If you still have errors I'm really out of ideas - try "apt-get -f install" and see if that gets you anywhere, but beyond that hopefully someone else can chime in with advice (my only other advice would be to reflash and start again - a bit drastic and I'm sure you don't really have the time!)