Marking as fix released because on 22.04, /etc/bind/rndc.key looks like this:
# ll /etc/bind/rndc.key -rw-r----- 1 bind bind 100 Apr 4 2022 /etc/bind/rndc.key
And bind9/named runs as the "bind" user:
# grep OPTIONS /etc/default/named OPTIONS="-u bind"
Marking as fix released because on 22.04, /etc/bind/rndc.key looks like this:
# ll /etc/bind/rndc.key
-rw-r----- 1 bind bind 100 Apr 4 2022 /etc/bind/rndc.key
And bind9/named runs as the "bind" user:
# grep OPTIONS /etc/default/named
OPTIONS="-u bind"