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1e376f7explicitly installed resolvconf to fix DNS breakage afterff541b8disabled APT recommends. But resolvconf adds dynamic resolver management and is unnecessary on a server. Similarly, systemd-resolved competes for /etc/resolv.conf. Write a static resolv.conf with unbound as primary and 9.9.9.9 as fallback. Purge resolvconf, stop and mask systemd-resolved to prevent it from overriding the static configuration.