Hello Julian, or anyone else affected,

Accepted apt into groovy-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/apt/2.1.10ubuntu0.3 in
a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
groovy to verification-done-groovy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-groovy. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: apt (Ubuntu Groovy)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-groovy

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to apt in Ubuntu.
https://bugs.launchpad.net/bugs/1916725

Title:
  Protected/Important packages are not deconfigured, require Force-
  LoopBreak

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Bionic:
  Triaged
Status in apt source package in Focal:
  Triaged
Status in apt source package in Groovy:
  Fix Committed
Status in apt source package in Hirsute:
  Fix Released

Bug description:
  [Impact]
  If a package that is Protected: yes (or Important: yes), or one of it's 
dependencies, is involved in a dependency loop with Breaks, APT requires 
APT::Force-LoopBreak instead of resolving the situation directly.

  On focal, we also introduce the actual support for protected packages
  to enable upgrading to later releases more easily (in case a protected
  package needs to be removed during the upgrade), and to make the
  backport more similar to main.

  [Test plan]
  Run the integration test suite (the autopkgtest) :)

  Our test suite covers the tests for both Breaks and Conflicts.

  Breaks:

  protected-sysvinit (= 1) without dependencies is installed
  protected-sysvinit (= 2) Pre-Depends protected-systemd-sysv
  protected-systemd-sysv (= 2) Breaks: protected-sysvinit (<< 2)

  Test: Install protected-sysvinit (= 2)
  Expected result: Unpacking protected-sysvinit (= 2) deconfigures 
protected-sysvinit (= 1), and then we unpack and configure protected-sysvinit 
(= 2) and end up with a working system.

  Conflicts: As for Breaks, but the Conflicts will remove the package
  temporarily, requiring the use of APT::Force-LoopBreak option.

  For focal, we also do have a test to check that the Protected field is
  being used.

  [Where problems could occur]
  We now allow dpkg to automatically deconfigure protected packages. This 
should just make them behave like normal packages to APT's eye, but bugs I 
guess could occur somewhere in the APT/dpkg interaction (this only applies to 
releases with Protected support in dpkg, Important is not affected, it's always 
been "normal" for dpkg).

  During development, we accidentally simplified the patch so much that
  Conflicts did not require Force-LoopBreak for temporary removal. We
  fixed that, but it points out that there is a place where the loop
  break check happens that is a potential regression place.

  On focal, we pass additional flags to dpkg that focal's dpkg does not
  understand, however, we only do that if dpkg asserts it does that, so
  in practice, this should all work fine and the code path will only be
  taken with >=groovy dpkg.

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