If you didn't configure the ethernet interface during installation, now's the time to do it. See Configuring TCP/IP Networking.
For Linux 4.2, create a symbolic link from /etc/resolv.conf/ to /etc/dhcpc/resolv.conf/:
rm /etc/resolv.conf
ln -s /etc/dhcpc/resolv.conf /etc/resolv.conf
For Linux 5.0+, updating /etc/resolv.conf/ is handled by the standard scripts.
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