There are also auto-updating debian and rpm sources.list. But there are also sources.list for Linux O.S.
Site of reference for sources.list for different linux distro that use APT as package management system: Ubuntu, Kubuntu, Linux Mint, Debian.The following (general) procedure helps to solve this: Make sure you have enabled Ubuntu repositories: When apt-get install is unable to locate a package, the package you want to install couldn't be found within repositories that you have added (those in in /etc/apt/sources.list and under /etc/apt//). There are many questions about this topic.
