Much has changed in systemd since 2017, please update this bug if this
still happens.
** Changed in: systemd (Ubuntu)
Status: New => Invalid
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Note that on my machine (clean 16.10 install, upgraded to 17.04 and
later 17.10), DNS resolution already partially broke in 17.04 (involving
the switch to systemd-resolve). With Ubuntu 17.04, DNS resolution was
broken after suspending, moving to a different WiFi, and resuming the
machine. This
