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The setting
dnssec-enable
innamed.conf.options
was deprecated in BIND 9.15 and removed in BIND 9.18. Ubuntu started shipping BIND 9.18 with version 22.04 (Jammy), which produces a config error and fails to start if the setting is present.This PR allows for omitting
dnssec-enable
fromnamed.conf.options
by settingdns::server::options::dnssec_enable
toundef
, and also makesundef
the default value for Ubuntu 22.04 and above.