I struggled with this long enough and took some notes about a workaround
I hope that this can help someone else as well.
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Touch seeded packages, which is subscribed to network-manager in Ubuntu.
The default behaviour for search domains changed from 16.10 to 17.04
Status in network-manager package in Ubuntu:
Since Ubuntu 17.04 uses systemd-resolved for DNS lookups the default
behaviour for search domains changed. By default systemd-resolved does
not use the domain supplied by DHCP as a search domain.
So network-manager should at least have an option to tell systemd-
networkd to change it's behaviour. In systemd-networkd the
corresponding option is named "UseDomains".
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