[Bug 1571174] Re: package squid3 failed to install/upgrade: dependency problems - leaving triggers unprocessed

[Adam Conrad]

Confirmed that dpkg in xenial-proposed fixes this for me.  Once we get
some decent autopkgtest coverage, I'll release it into the wild.

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Title:
  package squid3 failed to install/upgrade: dependency problems -
  leaving triggers unprocessed

Status in dpkg package in Ubuntu:
  Invalid
Status in squid3 package in Ubuntu:
  Invalid
Status in dpkg source package in Xenial:
  Fix Committed
Status in squid3 source package in Xenial:
  In Progress

Bug description:
  [ SRU Justification ]
  Older versions of ufw had an interest-await trigger, causing trigger loops in some cases, especially the case of upgrading squid3.

  The newer version fixed this, however if squid is upgraded first,
  that's no help.

  [ Test Case ]
  == In a wily chroot with updates/security enabled ==
  apt-get install ufw squid3
  sed -i -e 's/wily/xenial/g' /etc/apt/sources.list
  apt-get update
  apt-get dist-upgrade

  == Repeat the above with xenial-proposed added before the upgrade ==
  Should succeed if either squid or dpkg have been updated for the Breaks.

  [ Original Report ]
  During an upgrade from 15.10 to 16.04, upgrading squid3 erred out...

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: squid3 3.3.8-1ubuntu16.2
  ProcVersionSignature: Ubuntu 4.2.0-34.39-generic 4.2.8-ckt4
  Uname: Linux 4.2.0-34-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  Date: Sat Apr 16 05:33:51 2016
  DuplicateSignature: package:squid3:3.3.8-1ubuntu16.2:dependency problems - leaving triggers unprocessed
  ErrorMessage: dependency problems - leaving triggers unprocessed
  InstallationDate: Installed on 2015-12-07 (131 days ago)
  InstallationMedia: Ubuntu-Server 15.10 "Wily Werewolf" - Release amd64 (20151021)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1
   apt  1.2.10ubuntu1
  SourcePackage: squid3
  Title: package squid3 3.3.8-1ubuntu16.2 failed to install/upgrade: dependency problems - leaving triggers unprocessed
  UpgradeStatus: Upgraded to xenial on 2016-04-16 (0 days ago)
  modified.conffile..etc.apparmor.d.usr.sbin.squid3: [deleted]
  modified.conffile..etc.init.d.squid3: [deleted]
  modified.conffile..etc.init.squid3.conf: [deleted]
  modified.conffile..etc.logrotate.d.squid3: [deleted]
  modified.conffile..etc.resolvconf.update.libc.d.squid3: [deleted]
  modified.conffile..etc.squid3.errorpage.css: [deleted]
  modified.conffile..etc.squid3.msntauth.conf: [deleted]
  modified.conffile..etc.squid3.squid.conf: [deleted]
  modified.conffile..etc.ufw.applications.d.squid3: [deleted]

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