Comment 77 for bug 872652

@cmcanulty-
You should not need to use 'sudo add-key' at all. add-key is only relevant for older Ubuntu versions (and these backlight PPA's are only for Ubuntu 11.10). The best way to add the inverted-backlight PPA (which also includes the stuck-backlight fix) is to run these commands in a terminal window:

  sudo add-apt-repository ppa:kamalmostafa/inverted-backlight
  sudo apt-get update
  sudo apt-get dist-upgrade