linda

apt-get -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" install dnsmasq -y

参考：
https://stackoverflow.com/questions/51386952/automate-apt-get-install-dnsmasq-with-prompt
https://raphaelhertzog.com/2010/09/21/debian-conffile-configuration-file-managed-by-dpkg/