How to add repository keys in ubuntu

Download the gpg keys for the repositories and automatically add them to your repository keyring: Example: To obtain and add the Medibuntu repository key: wget –quiet http://packages.medibuntu.org/medibuntu-key.gpg -O – | sudo apt-key add – Example: To obtain and add the Google repository key: wget –quiet http://dl.google.com/linux/linux_signing_key.pub -O – | sudo apt-key add – Note: wget