I have upgraded my OS from Ubuntu 12.10 to 13.10. I had a clean installation of 13.10 version. Can someone please suggest which version of PostgreSQL and PostGIS can be installed on Ubuntu 13.10 version and how to install it?

I have looked at the steps given in How to install PostgreSQL 9.2 with PostGIS 2.0 on Ubuntu 11.10 (or higher)?? But the three repos are not adding after update.

Hence that answer is not helping me.