- extra="$extra -m http://debian-ports.org/debian-ports"
- extra="$extra -k /root/debian-ports-archive-2015.gpg"
+ extra="$extra -m http://ftp.de.debian.org/debian-ports"
+ extra="$extra -k /root/debian-ports-archive-2017.gpg"
+ extra="$extra -I debian-ports-archive-keyring"