** Description changed:

+ [Impact]
+ 
+  * Autopkgtest reports failures/regressions for docker.io on Xenial
+    because debian/tests/basic-smoke fails to deboostrap Debian stable,
+    since the release of the new stable, Debian buster (July 6th 2019).
+ 
+  * That caused changes to signatures and debootstrap procedures that
+    Xenial packages currently fail to handle.
+ 
+  * Such failures are false-positives of regressions with regards to
+    docker.io code *or* it's dependencies, which are thus flagged as
+    causing a regression to a reverse-dependency on autopkgtest.u.c.
+ 
+  * The solution is to revert to / stick with Debian stretch, which
+    has been the stable / status-quo before the buster release, and
+    is working correctly on both debian-archive-keyring/debootstrap
+    on Xenial.
+ 
+ [Test Case]
+ 
+  * Run docker.io autopkgtests or just 'debian/tests/basic-smoke'.
+ 
+ [Regression Potential]
+ 
+  * The 'debootstrap' command on 'debian/tests/basic-smoke' should
+    now continue to run past an early error, then hit other issues.
+ 
+    At this time, it has been verified to finish sucessfully in the
+    autopkgtest.ubuntu.com infrastructure, tested against a PPA.
+ 
+ [Other Info]
+ 
+  * Currently only Xenial is being reported/fixed, although this
+    issue might hit Bionic and Focal in the future (with 2+years
+    support period, extending over Debian releases) depending on
+    whether further changes might be needed post-Buster release.
+ 
+  * Debian's docker.io package only exists on Buster and later,
+    so are not susceptible to this problem right now.
+ 
+ [Original Description]
+ 
  With the release of Debian Buster (July 2019) the 'stable' distribution
  symlink on Debian archives changed from 'stretch' to 'buster'.
  
  This caused issues to 'debootstrap <variant> stable <target> <debian mirror>' 
on Xenial:
  (because of Xenial's older/pre-Buster debian-archive-keyring and debootstrap 
packages)
  1. failure to check signature of the Release file (which can be worked-around 
with --no-check-gpg)
  2. failure to unpack packages (which may need further changes)
  
  Thus just revert back to / stick with Debian Stretch as the suite to
  debootstrap for tests.
  
  This should prevent it to keep changing to newer releases, which depend
  on changes/fixes to other packages (not worth it just for the purpose of
  running 'true' in a docker container.)
  
  Original)
  
  + debootstrap --variant=minbase stable /tmp/tmp.CmnWmuSeHY 
http://httpredir.debian.org/debian
- I: Retrieving InRelease 
+ I: Retrieving InRelease
  I: Checking Release signature
  E: Release signed by unknown key (key id DCC9EFBF77E11517)
  + doExit
  ...
  basic-smoke          FAIL non-zero exit status 1
  
- 
  With --no-check-gpg)
  
  + debootstrap --no-check-gpg --variant=minbase stable /tmp/tmp.LbI1tZGEJb 
http://httpredir.debian.org/debian
- I: Retrieving InRelease 
- I: Retrieving Packages 
+ I: Retrieving InRelease
+ I: Retrieving Packages
  ...
  I: Unpacking the base system...
  ...
  W: Failure while installing base packages.  This will be re-attempted up to 
five times.
  W: See /tmp/tmp.LbI1tZGEJb/debootstrap/debootstrap.log for details
  + doExit
  ...
  basic-smoke          FAIL non-zero exit status 1
  
- 
  With s/stable/stretch/)
  
- + debootstrap --variant=minbase stretch /tmp/tmp.Eyr81GS2o6 
http://httpredir.debian.org/debian   
- I: Retrieving InRelease                                
+ + debootstrap --variant=minbase stretch /tmp/tmp.Eyr81GS2o6 
http://httpredir.debian.org/debian
+ I: Retrieving InRelease
  I: Failed to retrieve InRelease
- I: Retrieving Release      
- I: Retrieving Release.gpg   
- I: Checking Release signature                   
+ I: Retrieving Release
+ I: Retrieving Release.gpg
+ I: Checking Release signature
  I: Valid Release signature (key id 126C0D24BD8A2942CC7DF8AC7638D0442B90D010)
  I: Retrieving Packages
  ...
  I: Base system installed successfully.
  + tar -cC /tmp/tmp.5qp31fXQau .
  + docker import - debian
  ...
  + docker run --name test debian true
  ...
  ++ docker rm -f test
  ...
  ++ docker rmi debian
  ...
  + eval true
  ++ true
  ...
  basic-smoke          PASS
  ...

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https://bugs.launchpad.net/bugs/1855481

Title:
  xenial: debian/tests/basic-smoke fails to debootstrap stable since the
  release of buster

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