[Bug 1771791] [NEW] Need to pre-depend on stuff used by systemctl, so systemctl works in other package's preinst

[Julian Andres Klode]

Public bug reported:

[Impact]
systemd used to pre-depend on the libraries used by systemctl or something, but now systemctl uses libsystemd-shared, and there are no pre-depends for that, meaning that systemctl fails in maintainer scripts of other packages.

[Test case]
Grab the apt-clone file from comment #20 in bug 1766890, and upgrade it to bionic with apt dist-upgrade -o APT::Immediate-Configure=0. Make sure to not see error about missing libraries in systemctl.

[Regression potential]
Installation ordering changes. Might make things harder for apt to solve.

[Other info]
Debian 897986

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

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

** Bug watch added: Debian Bug tracker #897986
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=897986

** Also affects: systemd (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=897986
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1771791

Title:
  Need to pre-depend on stuff used by systemctl, so systemctl works in
  other package's preinst

Status in systemd package in Ubuntu:
  New
Status in systemd package in Debian:
  Unknown

Bug description:
  [Impact]
  systemd used to pre-depend on the libraries used by systemctl or something, but now systemctl uses libsystemd-shared, and there are no pre-depends for that, meaning that systemctl fails in maintainer scripts of other packages.

  [Test case]
  Grab the apt-clone file from comment #20 in bug 1766890, and upgrade it to bionic with apt dist-upgrade -o APT::Immediate-Configure=0. Make sure to not see error about missing libraries in systemctl.

  [Regression potential]
  Installation ordering changes. Might make things harder for apt to solve.

  [Other info]
  Debian 897986

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