I am trying to install the Medibuntu repository but receive
"W: GPG error: http://packages.medibuntu.org
natty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2EBC26B60C5A2783
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem. "
this from the terminal. What to do?