* Set -pf option for both isc-dhcp-server and isc-dhcp-server6 so they create their pid files in a path that's actually writable. (LP: #985417) * Also allow read access to the pid file in the apparmor profile, otherwise only the initial start succeeds. (LP: #1005062) * On upgrade from dhcp3-server, move /etc/default/dhcp3-server to /etc/default/isc-dhcp-server. (LP: #1003971) * On upgrade from dhcp3-relay, remove /etc/default/dhcp3-relay. (LP: #1005547) * Try to preseed isc-dhcp-relay with the values from /etc/default/dhcp3-relay. (LP: #1005547)