Howdy, in /etc/fai/apt/sources.list there is a reference to security.geo.debian.org. According to [1], this DNS zone has been dropped, and security.debian.org should be used instead (Stephan, you might also want to change this in the Ubuntu FAI PPA).
Cheers, Robert [1] http://dsa.debian.org/dsablog/2010/05/Dropping_security.geo.debian.org_zone/
