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 - retrieves a file from a network location. --quiet = no output. -O = Output downloaded item to terminal. The | (pipe symbol) is used to capture the output from the previous command (in our case the screen) and use it as an input for the piped command (i.e. apt-key, which adds it to the keyring).

• Alternatively (and perhaps more easily), you can use apt-key directly:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys KEY

where KEY is the missing key code printed in apt-get output, e.g. EF4186FE247510BE.

Note: Key servers often use port 11371. Make sure your firewall allows port 11371 to be open.