@Steve Dodd

libnss-resolve is not the upstream recommendation any more, and it
doesn't work without dbus, with non-nss based applications or
containers.

by default, recent ubuntu releases use a local stub-resolver which does
work more universally.

See http://manpages.ubuntu.com/manpages/bionic/en/man8/systemd-
resolved.8.html /etc/resolv.conf section the four modes of handling
/etc/resolv.conf of which Ubuntu uses the first (default / recommended
one)

It seems to me, your issues is different to the original bug reporter,
as the original bug reporter cannot resolve via $ systemd-resolve tool
either, which is equivalnt to libnss-resolve. Please do not reuse
somebody elses bug report for similar, but potentially different issues.
And instead open a new bug report. Bug reports are cheap.

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Touch seeded packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1771353

Title:
  Server feature level is now lower than when we began our transaction.
  Restarting with new ID

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  systemd 237-3ubuntu10 from bionic

  There is no /etc/netplan/* file.

  I'm getting some sort of a loop when systemd-resolved tries to resolve
  the hostname of my canonistack instance:

  ubuntu@bip:~$ systemd-resolve bip.lcy02.canonistack
  bip.lcy02.canonistack: resolve call failed: All attempts to contact name 
servers or networks failed

  systemd-resolved debug output loops over like this:
  Transaction 36341 is now 19121.
  Cache miss for bip.lcy02.canonistack IN A
  Transaction 19121 for <bip.lcy02.canonistack IN A> scope dns on */*.
  Using feature level UDP+EDNS0 for transaction 19121.
  Sending query packet with id 19121.
  Processing incoming packet on transaction 19121. (rcode=SUCCESS)
  Server feature level is now lower than when we began our transaction. 
Restarting with new ID.
  Transaction 19121 is now 17157.
  Cache miss for bip.lcy02.canonistack IN A
  Transaction 17157 for <bip.lcy02.canonistack IN A> scope dns on */*.
  Using feature level UDP+EDNS0 for transaction 17157.
  Sending query packet with id 17157.
  Processing incoming packet on transaction 17157. (rcode=SUCCESS)
  Server feature level is now lower than when we began our transaction. 
Restarting with new ID.
  ...

  Packet capture shows a loop like this:
  13:38:32.293524 IP 10.55.32.54.53786 > 10.55.32.1.53: 46096+ [1au] A? 
bip.lcy02.canonistack. (50)
  13:38:32.293753 IP 10.55.32.1.53 > 10.55.32.54.53786: 46096* 1/0/0 A 
10.55.32.54 (55)
  13:38:32.294026 IP 10.55.32.54.53786 > 10.55.32.1.53: 64494+ [1au] A? 
bip.lcy02.canonistack. (50)
  13:38:32.294249 IP 10.55.32.1.53 > 10.55.32.54.53786: 64494* 1/0/0 A 
10.55.32.54 (55)

  I'm going to attach the full debug output, and the pcap file.

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