Just upgraded to 17.04 from 16.04 and found DNS resolution stopped
randomly working.

As it turns out systemd-resolved decided for some obscure reason to
switch to google DNS which it can't reach compared to the locally
provided recursive resolver which continues to work just fine.

In summary in my case it isn't just a privacy concern but actually
breaks DNS resolution.

Aug 05 11:29:07 dtank0 systemd-resolved[8051]: Switching to system DNS server
Aug 05 11:29:07 dtank0 systemd[1]: Started Network Name Resolution.
Aug 05 11:33:58 dtank0 systemd-resolved[8051]: Switching to fallback DNS server

After the switch to DNS resolution on the host stopped working
because is not reachable from the host.

Interestingly stopping and disabling systemd-resolved followed by an 
"resolvconf -u" did not revert the config back to a working configuration.
It required removing /run/resolvconf/interface/systemd-resolved by hand 
(starting systemd-resolved will add that file but not remove on stop).

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  systemd-resolved: please do not use Google public DNS by default

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