FYI - final upstream fix was
https://github.com/NLnetLabs/unbound/commit/52aeaf4924ec3f6689e6aafedbe41473d2bda992

Which in the meantime was released in version 1.7 and later:
$ git tag --contains 52aeaf4924ec3f6689e6aafedbe41473d2bda992 | head -n 2
release-1.7.0@4583
release-1.7.0rc1

Thereby Cosmic is already fixed.
In fact we covred steps 1-3 of my comment #4.

That said I have had a unbound SRU planned anyway.
Lets fix this for T/X/B - especially as we already know it works back to Trusty 
as-is.

I realized that you could help a lot by providing a bit more detailed steps to 
reproduce the error.
I've added the rest of the SRU Template, but would ask you to provide steps to 
reproduce here.
>From your upstream bug report I can derive it would need setting up multiple 
>DNS servers, then unbound with domain-insecure.
Whatever you can add to make this testable for someone that will evaluate the 
SRU later on will help.

Note: also killing other EOL tasks.

** Description changed:

+ [Impact]
+ 
+  * DNSSEC setup with domain-insecure set fail to work.
+    The lookup will process all available servers leading to a very long 
+    lookup time.
+ 
+  * Backport upstream fix to stop checking for further trust points in that 
+    case.
+ 
+ [Test Case]
+ 
+  * TBD: Waiting for the bug reporter to provide the initial steps that we 
+    migth refine
+ 
+ [Regression Potential]
+ 
+  * The change will make it stop iterating for further DNSSEC records in 
+    certain configuration cases (domain-insecure). But this is just what 
+    the respective configuration is meant to do (see 
+    http://manpages.ubuntu.com/manpages/bionic/man5/unbound.conf.5.html)
+    So it should speed up certain cases were so far it still iterated
+    through servers, but giving that up early is just what it shoudl be per 
+    config.
+    I can think of a slight behavior change due to being faster now, but 
+    the end result should not change due to this. With that background I 
+    could think of two regressions:
+      a) the faster lookup makes automation wonder
+      b) there would be a condition we (and upstream) missed which would 
+         change the actual lookup return
+    Given that the code was not reverted upstream for quite a while I'd 
+    think the latter is only theoretical, and the former should be of low 
+    risk.
+ 
+ [Other Info]
+  
+  * n/a
+ 
+ 
+ ---
+ 
  Unbound contains a bug when domain-insecure is set for a (stub) zone.
  This bug is fixed, see https://www.nlnetlabs.nl/bugs-
  script/show_bug.cgi?id=2882. Can you please backport this to the Trusty
  package?
  
  With regards,
  Richard Arends

** No longer affects: unbound (Ubuntu Zesty)

** No longer affects: unbound (Ubuntu Artful)

** Changed in: unbound (Ubuntu)
       Status: Triaged => Fix Released

** Changed in: unbound (Ubuntu Trusty)
       Status: New => Triaged

** Changed in: unbound (Ubuntu Xenial)
       Status: New => Triaged

** Changed in: unbound (Ubuntu Bionic)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1732150

Title:
  Unbound behaviour changes (wrong) when domain-insecure is set for a
  stub zone with multiple stub-addr(s)

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