Error message received when trying to update the software on this PC.

[torreydale]

There is some light at the end of the tunnel when doing a web search on each one of these errors.  One result looks very much like your problem.  http://askubuntu.com/questions/388540/en...age-header

Lite Tweaks might be a good place to start cleaning up some of this.  Particularly the "Autoremove Packages" and "Package Cache" options.  Menu->System->Lite Tweaks

I would start there and then try re-running the updates.