SimpleBackportCreation attempt says: The value 'unstable' is invalid for APT::Default-Release

From	David <bouncingcats@gmail.com>
Newsgroups	linux.debian.user
Subject	SimpleBackportCreation attempt says: The value 'unstable' is invalid for APT::Default-Release
Date	2020-06-12 14:10 +0200
Message-ID	<AgQFr-wi-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi, on buster, I'm having a problem using the wiki instructions
https://wiki.debian.org/SimpleBackportCreation
specifically the 3 steps under the subheading
"Add source package entries for the testing distribution"
Although in my case I am seeking to obtain the source package
from unstable, not testing.

Per step 1, I add a temporary unstable deb-src line so that my
/etc/apt/sources.list becomes (comments removed, see last line):
$ cat /etc/apt/sources.list
deb http://approx:9999/debian/ buster main non-free contrib
deb http://security.debian.org/debian-security buster/updates main
contrib non-free
deb http://approx:9999/debian/ buster-updates main contrib non-free
deb http://approx:9999/debian/ buster-backports main contrib non-free
deb-src http://approx:9999/debian/ unstable main contrib non-free
$

Per step 2, I run apt update:
# apt update
Hit:1 http://approx:9999/debian buster InRelease
Hit:2 http://security.debian.org/debian-security buster/updates InRelease
Hit:3 http://approx:9999/debian buster-updates InRelease
Hit:4 http://approx:9999/debian buster-backports InRelease
Get:5 http://approx:9999/debian unstable InRelease [146 kB]
Get:6 http://approx:9999/debian unstable/contrib Sources [47.3 kB]
Get:7 http://approx:9999/debian unstable/non-free Sources [84.9 kB]
Get:8 http://approx:9999/debian unstable/main Sources [8,620 kB]
Fetched 8,899 kB in 7s (1,187 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
#

But step 3 fails:
$ apt source -t unstable cgdb
Reading package lists... Done
E: The value 'unstable' is invalid for APT::Default-Release as such a
release is not available in the sources
E: Unable to find a source package for
$ apt source -t testing cgdb
Reading package lists... Done
E: The value 'testing' is invalid for APT::Default-Release as such a
release is not available in the sources
E: Unable to find a source package for
$

What is wrong, and how do I fix it?

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SimpleBackportCreation attempt says: The value 'unstable' is invalid  for APT::Default-Release David <bouncingcats@gmail.com> - 2020-06-12 14:10 +0200
  Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release David <bouncingcats@gmail.com> - 2020-06-12 15:30 +0200
    Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Reco <recoverym4n@enotuniq.net> - 2020-06-12 15:50 +0200
  Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Reco <recoverym4n@enotuniq.net> - 2020-06-12 15:50 +0200
    Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Greg Wooledge <wooledg@eeg.ccf.org> - 2020-06-12 17:20 +0200
      Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Reco <recoverym4n@enotuniq.net> - 2020-06-12 17:30 +0200
        Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Greg Wooledge <wooledg@eeg.ccf.org> - 2020-06-12 18:10 +0200
          Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Reco <recoverym4n@enotuniq.net> - 2020-06-12 18:20 +0200
            Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Greg Wooledge <wooledg@eeg.ccf.org> - 2020-06-12 18:40 +0200
              Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Reco <recoverym4n@enotuniq.net> - 2020-06-12 18:40 +0200
              Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release <tomas@tuxteam.de> - 2020-06-12 18:40 +0200
                Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Reco <recoverym4n@enotuniq.net> - 2020-06-12 18:50 +0200
                Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release <tomas@tuxteam.de> - 2020-06-12 19:00 +0200
                Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Greg Wooledge <wooledg@eeg.ccf.org> - 2020-06-12 19:10 +0200
                Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Greg Wooledge <wooledg@eeg.ccf.org> - 2020-06-12 19:10 +0200
                Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release <tomas@tuxteam.de> - 2020-06-12 19:20 +0200
                Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Greg Wooledge <wooledg@eeg.ccf.org> - 2020-06-12 19:40 +0200
                Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Reco <recoverym4n@enotuniq.net> - 2020-06-12 20:00 +0200
              Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release steve <dlist@bluewin.ch> - 2020-06-12 18:50 +0200
        Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-13 11:10 +0200
          Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Reco <recoverym4n@enotuniq.net> - 2020-06-13 11:30 +0200
            Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-13 12:00 +0200
              Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Reco <recoverym4n@enotuniq.net> - 2020-06-13 12:10 +0200
  Re: SimpleBackportCreation attempt says: The value 'unstable' is  invalid for APT::Default-Release Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-12 18:10 +0200
    [solved] Re: SimpleBackportCreation attempt says: The value  'unstable' is invalid for APT::Default-Release David <bouncingcats@gmail.com> - 2020-06-13 07:40 +0200
      Re: [solved] Re: SimpleBackportCreation attempt says: The value  'unstable' is invalid for APT::Default-Release <tomas@tuxteam.de> - 2020-06-13 10:00 +0200
        Re: [solved] Re: SimpleBackportCreation attempt says: The value  'unstable' is invalid for APT::Default-Release David <bouncingcats@gmail.com> - 2020-06-23 05:20 +0200
      Re: [solved] Re: SimpleBackportCreation attempt says: The value  'unstable' is invalid for APT::Default-Release Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-13 11:00 +0200
        Re: [solved] Re: SimpleBackportCreation attempt says: The value  'unstable' is invalid for APT::Default-Release David <bouncingcats@gmail.com> - 2020-06-23 05:20 +0200
      Re: [solved] Re: SimpleBackportCreation attempt says: The value  'unstable' is invalid for APT::Default-Release Greg Wooledge <wooledg@eeg.ccf.org> - 2020-06-14 15:10 +0200
        Re: [solved] Re: SimpleBackportCreation attempt says: The value  'unstable' is invalid for APT::Default-Release David <bouncingcats@gmail.com> - 2020-06-23 05:20 +0200

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