In terms of expectations on bionic:
1) /etc/resolv.conf should be a symlink to ../run/systemd/resolve/stub-
2) The contents should point at `nameserver 127.0.0.53` and list search
domains, if any are available. I.e. the contents shown in the bug
description is correct.
3) The nameservers are now preferred to be on the per-interface basis,
thus e.g. nameserver should be declared on the interface that has the
default route. Indeed sending "global" configs is loss of information
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[2.4, bionic] /etc/resolv.conf not configured correctly in Bionic,
leads to no DNS resolution
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