SHELL

The following signatures were invali gpg

sudo apt-key list  | grep "expired: " | sed -ne 's|pub .*/([^ ]*) .*|1|gp' | xargs -n1 sudo apt-key adv --keyserver keys.gnupg.net --recv-keys

The following signatures were invali gpg

sudo apt-key list | grep "expired: "
sudo apt-key adv --keyserver keys.gnupg.net --recv-keys [KEY]