ubuntu@lp1849733-d:~$ dpkg -l systemd|grep ii
ii  systemd        240-6ubuntu5.7 amd64        system and service manager
ubuntu@lp1849733-d:~$ dig +noanswer +noedns toomany.ddstreet.org
;; Truncated, retrying in TCP mode.

; <<>> DiG 9.11.5-P1-1ubuntu2.5-Ubuntu <<>> +noanswer +noedns 
toomany.ddstreet.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57225
;; flags: qr rd ra; QUERY: 1, ANSWER: 40, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;toomany.ddstreet.org.          IN      A

;; Query time: 0 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Thu Nov 14 15:15:13 UTC 2019
;; MSG SIZE  rcvd: 678

ubuntu@lp1849733-d:~$ sudo resolvectl flush-caches 
ubuntu@lp1849733-d:~$ dig +noanswer +noedns toomany.ddstreet.org

; <<>> DiG 9.11.5-P1-1ubuntu2.5-Ubuntu <<>> +noanswer +noedns 
toomany.ddstreet.org
;; global options: +cmd
;; connection timed out; no servers could be reached



ubuntu@lp1849733-d:/etc/systemd/network$ dpkg -l systemd|grep ii
ii  systemd        240-6ubuntu5.8 amd64        system and service manager
ubuntu@lp1849733-d:/etc/systemd/network$ dig +noanswer +noedns 
toomany.ddstreet.org
;; Truncated, retrying in TCP mode.

; <<>> DiG 9.11.5-P1-1ubuntu2.5-Ubuntu <<>> +noanswer +noedns 
toomany.ddstreet.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26936
;; flags: qr rd ra; QUERY: 1, ANSWER: 40, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;toomany.ddstreet.org.          IN      A

;; Query time: 0 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Thu Nov 14 15:21:10 UTC 2019
;; MSG SIZE  rcvd: 678

ubuntu@lp1849733-d:/etc/systemd/network$ sudo resolvectl flush-caches 
ubuntu@lp1849733-d:/etc/systemd/network$ dig +noanswer +noedns 
toomany.ddstreet.org
;; Truncated, retrying in TCP mode.

; <<>> DiG 9.11.5-P1-1ubuntu2.5-Ubuntu <<>> +noanswer +noedns 
toomany.ddstreet.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57527
;; flags: qr rd ra; QUERY: 1, ANSWER: 40, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;toomany.ddstreet.org.          IN      A

;; Query time: 0 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Thu Nov 14 15:21:14 UTC 2019
;; MSG SIZE  rcvd: 678


** Tags removed: verification-needed-disco
** Tags added: verification-done-disco

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https://bugs.launchpad.net/bugs/1849658

Title:
  resolved fallback to TCP fails for truncated UDP replies

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