Comment 4 for bug 1406141

Hi, there is already ppa for this updated package from Webupd8 based on your works. It is explained here,

http://www.webupd8.org/2015/11/display-keystrokes-in-your-screencasts.html

And here it is.

sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install screenkey