[Bug 1351306] [NEW] Cannot uninstall upstart and install systemd-sysv

[Martin Pitt]

Public bug reported:

upstart is currently quite deeply wired into our dependencies. Even in a
minimally bootstrapped chroot needs it, although this doesn't do any
booting at all:

# dpkg -P upstart
dpkg: dependency problems prevent removal of upstart:
 initscripts depends on upstart.
 plymouth depends on upstart (>= 1.11-0ubuntu3).

On a desktop the list is quite a bit longer:

 ubuntu-minimal depends on upstart.
 avahi-daemon depends on upstart (>= 0.6.7-4).
 friendly-recovery depends on upstart.
 initscripts depends on upstart.
 ureadahead depends on upstart (>= 0.6.0).
 plymouth depends on upstart (>= 1.11-0ubuntu3).
 dbus depends on upstart (>= 0.6.3-6).
 unity-services depends on upstart.
 init depends on upstart.

Most of the latter probably don't need to; versioned depends might be
converted into equivalent versioned breaks, for others an alternative
dependency might be considered. The main exception is that we are using
session upstart on the desktop (unity-services etc.), for this we
probably need to split out an upstart-sysv (for /sbin/init, reboot,
halt, etc., similar to systemd-sysv) or an upstart-core (similar to
sysvinit-core vs. sysvinit).

** Affects: plymouth (Ubuntu)
     Importance: Undecided
     Assignee: Martin Pitt (pitti)
         Status: Fix Committed

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

** Also affects: plymouth (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1351306

Title:
  Cannot uninstall upstart and install systemd-sysv

Status in “plymouth” package in Ubuntu:
  Fix Committed
Status in “upstart” package in Ubuntu:
  New

Bug description:
  upstart is currently quite deeply wired into our dependencies. Even in
  a minimally bootstrapped chroot needs it, although this doesn't do any
  booting at all:

  # dpkg -P upstart
  dpkg: dependency problems prevent removal of upstart:
   initscripts depends on upstart.
   plymouth depends on upstart (>= 1.11-0ubuntu3).

  On a desktop the list is quite a bit longer:

   ubuntu-minimal depends on upstart.
   avahi-daemon depends on upstart (>= 0.6.7-4).
   friendly-recovery depends on upstart.
   initscripts depends on upstart.
   ureadahead depends on upstart (>= 0.6.0).
   plymouth depends on upstart (>= 1.11-0ubuntu3).
   dbus depends on upstart (>= 0.6.3-6).
   unity-services depends on upstart.
   init depends on upstart.

  Most of the latter probably don't need to; versioned depends might be
  converted into equivalent versioned breaks, for others an alternative
  dependency might be considered. The main exception is that we are
  using session upstart on the desktop (unity-services etc.), for this
  we probably need to split out an upstart-sysv (for /sbin/init, reboot,
  halt, etc., similar to systemd-sysv) or an upstart-core (similar to
  sysvinit-core vs. sysvinit).

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