I downloaded the Ubuntu 12.10 mini.iso today. My intentions were to install the Razor-QT ppa.
I found this here
sudo apt-get install python-software-properties
Did not work. I can't locate the package.
The package was moved. I found it: Replace python-software-properties Depends with 'software-properties-common'
sudo apt-get update; sudo apt-get install software-properties-common