For a couple day, I’ve been getting this error when running
sudo aptitude update on debian:
W: GPG error: http://gulus.usherbrooke.ca testing Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 010908312D230C5F W: You may want to run apt-get update to correct these problems
The solution is to install the new keys for 2006 with this command:
wget http://ftp-master.debian.org/ziyi_key_2006.asc -O - | \ apt-key add -
Props to pthichat for the solution.