jb bec wrote: > wget http://ftp-master.debian.org/ziyi_key_2006.asc -O - | apt-key add - Oviously, the backports archive is not signed with the debian master key. You need to get the right one: gpg --keyserver subkeys.pgp.net --recv-keys 16BA136C gpg --armor --export 16BA136C | apt-key add - -- Address: Daniel Baumann, Burgunderstrasse 3, CH-4562 Biberist Email: daniel.baumann@panthera-systems.net Internet: http://people.panthera-systems.net/~daniel-baumann/