I tried the following link to install via the commands.
$ sudo apt-get update
$ sudo apt-get install chromium-browser
$ sudo add-apt-repository ppa:skunk/pepper-flash
$ sudo apt-get update
$ sudo apt-get install pepperflashplugin-nonfree
$ sudo update-pepperflashplugin-nonfree --install
However the package pepperflashplugin-nonfree
is nowhere to be seen, what repository does it lie within?