Reading package lists... Done
Building dependency tree
Reading state information... Done
bind9 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
I followed the "how to" right through, starting with installing bind9, stopping it, moving files around and so on, right up to attempting to start bind9 again at the end. It's at this point I get the error.