Don't know if this was happening to anyone else. I kept having this problem when I would apt-get install <package> and go the error either saying <package> was not found or that there was no installation candidate. No amount of tinkering with sources.list seemed to solve this. However, following found in the Ubuntu forums fixed the problem ...
cd /etc/apt
sudo mv sources.list sources.list.bak
sudo vi sources.list # then save and quit (:wq) to create a blank file
sudo apt-get update
sudo rm sources.list
sudo cp sources.list.bak sources.list
sudo apt-get update
After this I was able to apt-get to my heart's content.