[Bug 1974456] [NEW] regression: apt.postint fails if never previously configured

[David Röthlisberger]

Public bug reported:

#1968154 removed `/etc/kernel/postinst.d/apt-auto-removal` in this patch:
https://git.launchpad.net/ubuntu/+source/apt/commit/?id=f9d2d993687c0d5223c241956ef6a0aabcf15bf0

...but `apt.postinst` still tries to run it:

    # create kernel autoremoval blacklist on update
    if dpkg --compare-versions "$2" lt 0.9.9.3; then
        /etc/kernel/postinst.d/apt-auto-removal
    fi

If I understand correctly, "$2" is the most-recently-configured-version,
and if it's empty `dpkg --compare-versions lt` will evaluate to true.

This fails when I'm building a focal (20.04) userspace from scratch:

    $ dpkg --configure -a
    [...]
    Setting up apt (2.0.8) ...
    /var/lib/dpkg/info/apt.postinst: 65: /etc/kernel/postinst.d/apt-auto-removal: not found
    dpkg: error processing package apt (--configure):
     installed apt package post-installation script subprocess returned error exit status 127

It works with apt 2.0.6.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1974456

Title:
  regression: apt.postint fails if never previously configured

Status in apt package in Ubuntu:
  New

Bug description:
  #1968154 removed `/etc/kernel/postinst.d/apt-auto-removal` in this patch:
  https://git.launchpad.net/ubuntu/+source/apt/commit/?id=f9d2d993687c0d5223c241956ef6a0aabcf15bf0

  ...but `apt.postinst` still tries to run it:

      # create kernel autoremoval blacklist on update
      if dpkg --compare-versions "$2" lt 0.9.9.3; then
          /etc/kernel/postinst.d/apt-auto-removal
      fi

  If I understand correctly, "$2" is the most-recently-configured-
  version, and if it's empty `dpkg --compare-versions lt` will evaluate
  to true.

  This fails when I'm building a focal (20.04) userspace from scratch:

      $ dpkg --configure -a
      [...]
      Setting up apt (2.0.8) ...
      /var/lib/dpkg/info/apt.postinst: 65: /etc/kernel/postinst.d/apt-auto-removal: not found
      dpkg: error processing package apt (--configure):
       installed apt package post-installation script subprocess returned error exit status 127

  It works with apt 2.0.6.

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