[Bug 1844634] [NEW] Removals keep removing dependencies if removal of a package fails

[Julian Andres Klode]

Public bug reported:

[Impact]

Assuming packages A and B, with A depending on B. A has a failing prerm
script.

Expected behavior:
- A fails to be removed, A and B stay unchanged
Actual behavior:
- A fails to be removed
- B is still removed

This might crash their system (e.g. if A is systemd and B is
libsystemd0).

[Test case]
See Impact. An automated version of the test case (test-apt-get-remove-depends) is included and run on autopkgtest.

[Regression potential]
We now abort earlier in removal failures, that might be harder to recover from or not, nobody really knows.

** Affects: apt (Ubuntu)
     Importance: High
     Assignee: Julian Andres Klode (juliank)
         Status: Fix Committed

** Affects: apt (Debian)
     Importance: Unknown
         Status: Unknown

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https://bugs.launchpad.net/bugs/1844634

Title:
  Removals keep removing dependencies if removal of a package fails

Status in apt package in Ubuntu:
  Fix Committed
Status in apt package in Debian:
  Unknown

Bug description:
  [Impact]

  Assuming packages A and B, with A depending on B. A has a failing
  prerm script.

  Expected behavior:
  - A fails to be removed, A and B stay unchanged
  Actual behavior:
  - A fails to be removed
  - B is still removed

  This might crash their system (e.g. if A is systemd and B is
  libsystemd0).

  [Test case]
  See Impact. An automated version of the test case (test-apt-get-remove-depends) is included and run on autopkgtest.

  [Regression potential]
  We now abort earlier in removal failures, that might be harder to recover from or not, nobody really knows.

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