repository - How to find which PPA contains a specific package?

I would like to know which repository contains a specific package, in order to add the PPA link to the sources.list file.

The package can also be outside of the official repositories (multiverse or similar).

I dont want to find only the repository name but also the full qualified PPA link name to be added to the sources without any additional struggle.

y-ppa-manager can do that for you:

sudo add-apt-repository ppa:webupd8team/y-ppa-manager
sudo apt-get update
sudo apt-get install y-ppa-manager

Search the package and use the button Add selected PPA to add the PPA.