Hi *Timothée Ravier*, I tried locally signing your key. But this is what I get pacman-key --lsign-key C8D83B6AE4B8685A7290545FDB27818F78688F83 -> Locally signing key C8D83B6AE4B8685A7290545FDB27818F78688F83... ==> ERROR: C8D83B6AE4B8685A7290545FDB27818F78688F83 could not be locally signed. But adding the key was sucessful. pacman-key --add /home/archie/Downloads/siosm_gpg.pub ==> Updating trust database... gpg: next trustdb check due at 2014-01-22 I am not sure how to do this. I read your links but coudn't get around it.