Case: On Ubuntu (and derivatives), after booting up, websites suddenly fail to resolve and instant messengers fail to connect. Other devices on the LAN resolve addresses successfully.
Device browser fails with:
This site can't be reached
DNS address could not be found.
Systemd’s DNS caches might need to be flushed:
confirmed on Ubuntu 16.04, 17.04, 18.04
sudo systemd-resolve --flush-caches
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