Add missing GPG keys

GPG errors:

W: GPG error: http://ppa.launchpad.net jaunty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6D975C4791E7EE5E
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://ppa.launchpad.net jaunty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A9BF3BB4E5E17B5
W: GPG error: http://ppa.launchpad.net jaunty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7FB8BEE0A1F196A8

The fix for this is to re-download the keys using the hexidecimal numbers given in the error. Open a terminal and run the following command

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys hexadeciaml-number-shows=in-error

The output should look like this:
"gpg: requesting key hexadecimal-output from hkp server keyserver.ubuntu.com"

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