sudo apt-get update 2> /tmp/keymissing; for key in $(grep "BADSIG" /tmp/keymissing |sed "s/.*BADSIG //" | cut -d " " -f1); do echo -e "nProcessing key: $key"; gpg --keyserver subkeys.pgp.net --recv $key && gpg --export --armor $key | sudo apt-key add -; done