APT / Synaptic Bad signature

What to do when experiencing The following signatures were invalid: BADSIG ... when refreshing the packages from the repository?

# sudo -s -H
# apt-get clean
# rm /var/lib/apt/lists/*
# rm /var/lib/apt/lists/partial/*
# apt-get clean
# apt-get update

linux/BadSignature (last edited 2011-03-28 12:14:32 by PieterSmit)