[Bug 1767911] Re: package man-db 2.7.6.1-2 failed to install/upgrade: triggers looping, abandoned

[Colin Watson]

dpkg: cycle found while processing triggers:
 chain of packages whose triggers are or may be responsible:
  man-db -> desktop-file-utils
 packages' pending triggers which are or may be unresolvable:
  man-db: /usr/share/man
  desktop-file-utils: /usr/share/applications
  gconf2: /usr/share/GConf/gsettings
  ufw: /etc/ufw/applications.d

There's no real cycle here (while desktop-file-utils installs manual
pages, man-db for its part doesn't install anything that would cause
desktop-file-utils to be triggered), so I think this must be a dpkg bug.

** Package changed: man-db (Ubuntu) => dpkg (Ubuntu)

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Title:
  package man-db 2.7.6.1-2 failed to install/upgrade: triggers looping,
  abandoned

Status in dpkg package in Ubuntu:
  New

Bug description:
  i did an update to ubuntu mate 17.10 and man-db 2.7.6.1-2 failed to
  upgrade

  ProblemType: Package
  DistroRelease: Ubuntu 17.10
  Package: man-db 2.7.6.1-2
  ProcVersionSignature: Ubuntu 4.13.0-39.44-generic 4.13.16
  Uname: Linux 4.13.0-39-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3.8
  Architecture: amd64
  Date: Sat Apr 28 02:59:30 2018
  ErrorMessage: triggers looping, abandoned
  InstallationDate: Installed on 2017-12-04 (146 days ago)
  InstallationMedia: Ubuntu-MATE 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  Python3Details: /usr/bin/python3.6, Python 3.6.3, python3-minimal, 3.6.3-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.14, python-minimal, 2.7.14-2ubuntu1
  RelatedPackageVersions:
   dpkg 1.18.24ubuntu1
   apt  1.5.1
  SourcePackage: man-db
  Title: package man-db 2.7.6.1-2 failed to install/upgrade: triggers looping, abandoned
  UpgradeStatus: Upgraded to artful on 2018-04-29 (1 days ago)

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