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systemd-resolved supports drop-in config snippets, e.g. by placing .conf files in /etc/systemd/resolved.conf.d. During install, use a drop-in config to set DNSStubListener=no, instead of modifying the main config. This is generally better practice, and also prevents conflicts when distribution packages are upgraded, which may include new versions of /etc/systemd/resolved.conf. Signed-off-by: Nick Rosbrook <enr0n@ubuntu.com>