[Bug 1750465] Re: upgrade attempting to process triggers out of order (package plymouth-theme-ubuntu-text 0.9.2-3ubuntu17 failed to install/upgrade: dependency problems - leaving triggers unprocessed)

[Steve Langasek]

** Also affects: budgie-artwork (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: ubuntu-gnome-default-settings (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: ubuntu-mate-artwork (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: plymouth (Ubuntu)
       Status: Confirmed => Fix Committed

** Also affects: apt (Ubuntu Artful)
   Importance: Undecided
       Status: New

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

** Also affects: ubuntu-gnome-default-settings (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Also affects: kubuntu-settings (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Also affects: ubuntu-mate-artwork (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Also affects: budgie-artwork (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Description changed:

+ [SRU Justification]
+ A package manager bug can cause dist-upgrades from 17.10 to 18.04 to fail because of trying to process triggers out of order.  Since the trigger being run is that of the currently-installed plymouth package, it is not guaranteed to be sufficient to fix the version of the package in 18.04.
+ 
+ [Test case]
+ 1. Install plymouth-themes-ubuntu-text from artful-proposed.
+ 2. Run a release upgrade with each of update-manager -d, do-release-upgrade -d, and apt-get dist-upgrade (the last after manually changing sources.list).
+ 3. Verify that in each case, the upgrade completes successfully, with no errors about out-of-order trigger configuration.
+ 
+ [Regression potential]
+ noawait triggers have been supported in dpkg since 1.16.1, which is older than the version in precise (https://manpages.debian.org/jessie/dpkg-dev/deb-triggers.5.en.html).  A noawait trigger is considered appropriate whenever the triggered package does not need to block the triggering package.  There is no reason for a plymouth theme package to need to block configuration of an essential package in this case.  noawait triggers are well-exercised in the distro now, so the risk of regression from this change should be low.
+ 
+ There is unfortunately not a known reproducer for the original bug, so
+ the test case, while it should guard against regressions, is not strong
+ confirmation that the bug is fixed.
+ 
+ 
+ [Original description]
  Failure during upgrade attempt from Xubuntu 17.10 to Xubuntu 18.04
  
  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: plymouth-theme-ubuntu-text 0.9.2-3ubuntu17
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  Date: Sun Feb 18 23:41:49 2018
  DefaultPlymouth: /usr/share/plymouth/themes/xubuntu-logo/xubuntu-logo.plymouth
  ErrorMessage: dependency problems - leaving triggers unprocessed
  InstallationDate: Installed on 2017-10-24 (118 days ago)
  InstallationMedia: Xubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017.1)
  Lsusb:
-  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
-  Bus 001 Device 004: ID 8087:0a2a Intel Corp. 
-  Bus 001 Device 003: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
-  Bus 001 Device 002: ID 1bcf:2c01 Sunplus Innovation Technology Inc. 
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
+  Bus 001 Device 004: ID 8087:0a2a Intel Corp.
+  Bus 001 Device 003: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
+  Bus 001 Device 002: ID 1bcf:2c01 Sunplus Innovation Technology Inc.
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. Inspiron 5567
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic.efi.signed root=UUID=d2256612-d86a-469b-be01-94e1fdcca333 ro quiet splash vt.handoff=1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic.efi.signed root=UUID=d2256612-d86a-469b-be01-94e1fdcca333 ro quiet splash vt.handoff=1
  Python3Details: /usr/bin/python3.6, Python 3.6.4+, python3-minimal, 3.6.4-1
  PythonDetails: /usr/bin/python2.7, Python 2.7.14+, python-minimal, 2.7.14-4
  RelatedPackageVersions:
-  dpkg 1.19.0.5ubuntu1
-  apt  1.5.1
+  dpkg 1.19.0.5ubuntu1
+  apt  1.5.1
  SourcePackage: plymouth
  TextPlymouth: /usr/share/plymouth/themes/xubuntu-text/xubuntu-text.plymouth
  Title: package plymouth-theme-ubuntu-text 0.9.2-3ubuntu17 failed to install/upgrade: dependency problems - leaving triggers unprocessed
  UpgradeStatus: Upgraded to bionic on 2018-02-19 (0 days ago)
  dmi.bios.date: 01/12/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.1.0
  dmi.board.name: 01W6F7
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.1.0:bd01/12/2017:svnDellInc.:pnInspiron5567:pvr:rvnDellInc.:rn01W6F7:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: Inspiron
  dmi.product.name: Inspiron 5567
  dmi.sys.vendor: Dell Inc.

** Changed in: plymouth (Ubuntu Artful)
       Status: New => In Progress

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Title:
  upgrade attempting to process triggers out of order (package plymouth-
  theme-ubuntu-text 0.9.2-3ubuntu17 failed to install/upgrade:
  dependency problems - leaving triggers unprocessed)

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