This question already has an answer here:
Every time I add a PPA I cannot see the package I'm trying to install. I suppose I must be doing something wrong! So here's my latest effort:
In a Terminal I typed:
sudo add-apt-repository ppa:jeromerobert/misc
and that seemed to work correctly
Then I typed:
sudo apt-get update
But when I go to Synaptic or Software Center the application I want to install is not there. Could someone please tell me what I'm doing wrong?