Public bug reported:

On 16.04 I had no problems. On 18.04 systemd-resolved fails to resolve
host name without domain (using nslookup) even though DNS server is
reported by systemd-resolve --status. If to provide DNS to nslookup
explicitly, then the name is resolved.

$ systemd-resolve --status
Global
          DNSSEC NTA: 10.in-addr.arpa
                      16.172.in-addr.arpa
                      168.192.in-addr.arpa
                      17.172.in-addr.arpa
                      18.172.in-addr.arpa
                      19.172.in-addr.arpa
                      20.172.in-addr.arpa
                      21.172.in-addr.arpa
                      22.172.in-addr.arpa
                      23.172.in-addr.arpa
                      24.172.in-addr.arpa
                      25.172.in-addr.arpa
                      26.172.in-addr.arpa
                      27.172.in-addr.arpa
                      28.172.in-addr.arpa
                      29.172.in-addr.arpa
                      30.172.in-addr.arpa
                      31.172.in-addr.arpa
                      corp
                      d.f.ip6.arpa
                      home
                      internal
                      intranet
                      lan
                      local
                      private
                      test

Link 3 (wlp4s0)
      Current Scopes: none
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no

Link 2 (enp0s31f6)
      Current Scopes: DNS
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
         DNS Servers: 192.168.200.1

$ nslookup sniffer
Server:         127.0.0.53
Address:        127.0.0.53#53

** server can't find sniffer: SERVFAIL

$ nslookup sniffer 192.168.200.1
Server:         192.168.200.1
Address:        192.168.200.1#53

Name:   sniffer
Address: 192.168.200.1

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1790628

Title:
  systemd from 18.04 fails to resolve name without domain

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