12.10 is unsupported so no repositories for software. Support for 12.10 was dropped May 16, 2014 (see this link
I would install 14.04 LTS version if I were you. As you can see from the link previously, it would be supported until April 2019. Option 2 is reinstall 12.04 which is covered until 2017. I would do option 2 if I had older hardware that is unsupported on 14.04.
I noticed you made a comment "for my present setup....". Is there a hardware issue? I see where you are running it on virtualbox, why not download and install 14.04?