2. Debian based systems, including Ubuntu
apt-key finger | grep HFS -C 2
pub 1024D/EF91DF05 2011-02-24 Key fingerprint = 60AC EDB6 980E A06D 4879 9299 CDBD F30C EF91 DF05 uid IT Services HFS Team (GPG signing key) <firstname.lastname@example.org> sub 1024g/2EB4A12C 2011-02-24
Note that depending on when the key was first installed it may say OUCS instead of IT Services. If the key fingerprint does not match that shown above then contact email@example.com for advice.