[Bug 1560797] Re: apt does not configure Pre-Depends: before depending package

[Richard Uijen]

I think I got this bug. I upgraded to 16.04 because my update manager proposed that I do so. 
I first had a message that I should choose between lightdm and gdm3. I chose the default: lightdm.
Then systemd failed to install, then (I don't know in what order)
systemd-sysv
lidpam-systemd
gvfs-daemons
gvfs
gvfs-backends
udisk2
nautilus
gvfs-fuse
policy-kit-1
ubuntu-system-service
gnome-settings-daemon
colord
gnome-control-center
gnome-bluetooth
pulseaudio
indicator-sound
unity-control-center

By then, I feared that my installation was lost. I got a zillion more
errors.

At the end, I got a message that I might have a none-working system. So, instead of restarting, I did what some internet pages suggested:
run the following in a terminal (and do what seems logical to do):
apt-get -f install
apt-get update
apt-get upgrade 
(I think I repeated the series a few times, until no warnings were given anymore and all the work was done)
Then I crossed my fingers and restarted,... and got a welcome screen and could login.
This, however, was followed by some error messages and a dialogue which led me to this page, ultimately.

So, I think my system works (despite all), but I'm not sure.

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https://bugs.launchpad.net/bugs/1560797

Title:
  apt does not configure Pre-Depends: before depending package

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Trusty:
  Fix Released
Status in apt source package in Wily:
  Fix Released

Bug description:
  Happened during upgrade to 16.04, don't know any more details.

  --
  SRU INFORMATION
  ===============
  Fix: https://anonscm.debian.org/cgit/apt/apt.git/commit/?id=c75e60eb (applied in Xenial last week)

  Test case:
   - Install clean wily amd64 desktop + install libgcrypt20:i386
   - change apt sources to xenial, apt-get dist-upgrade
   - with current apt, upgrade will often fail because systemd expects a configure libgcrypt20, or util-linux expects a configured libudev1 or similar, but these packages aren't configured.
   - with the fixed apt, the upgrade should run smoothly.

  Regression potential: Any bug here might potentially break package
  installation or upgrades completely. That said, the fix is quite
  obvious and has been in production in xenial for a week. Testing this
  SRU should include several dist-upgrades as well as some normal
  package installs in trusty/wily.


  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: systemd-sysv 225-1ubuntu9.1
  Uname: Linux 4.4.5-040405-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  Date: Tue Mar 22 22:56:03 2016
  ErrorMessage: pre-dependency problem - not installing systemd-sysv
  InstallationDate: Installed on 2013-04-24 (1064 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130423.1)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1
   apt  1.2.7
  SourcePackage: systemd
  Title: package systemd-sysv 225-1ubuntu9.1 failed to install/upgrade: pre-dependency problem - not installing systemd-sysv
  UpgradeStatus: Upgraded to xenial on 2016-03-23 (0 days ago)

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