I just ran into this today:

Setting up avahi-utils (0.7-3.1ubuntu1) ...
dpkg: cycle found while processing triggers:
 chain of packages whose triggers are or may be responsible:
  gnome-menus -> ufw
 packages' pending triggers which are or may be unresolvable:
  gnome-menus: /usr/share/applications
  libc-bin: ldconfig
  shim-signed: shim-secureboot-policy
  gconf2: /usr/share/GConf/gsettings: /usr/share/gconf/schemas
  ufw: /etc/ufw/applications.d
dpkg: error processing package gnome-menus (--configure):
 triggers looping, abandoned

Errors were encountered while processing:
Setting up gnome-menus (3.13.3-11ubuntu1) ...
Errors were encountered while processing:^M
E: Sub-process /usr/bin/dpkg returned an error code (1)

** Attachment added: "log of apt-get dist-upgrade with failure"

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  gnome-menus 3.13.3-6ubuntu5 failed to install/upgrade: triggers
  looping, abandoned - gnome-menus -> gconf2

Status in gnome-menus package in Ubuntu:

Bug description:
  apt log session:

  dpkg: a cycle was encountered while processing the triggers:
    the packet chain of these triggers are or may be responsible:
     gnome-menus -> gconf2
    triggers of pending packets that are or may be insoluble:
     gnome-menus: / usr / share / applications
     libc-bin: ldconfig
     gconf2: / usr / share / GConf / gsettings
  dpkg: error processing package gnome-menus (--configure):
    loop triggers, abandoned


  $ systemctl  status apport.service

  ● apport.service - LSB: automatic crash report generation
     Loaded: loaded (/etc/init.d/apport; generated; vendor preset: enabled)
     Active: failed (Result: timeout) since Thu 2017-12-14 08:43:36 -02; 1h 
14min ago
       Docs: man:systemd-sysv-generator(8)
      Tasks: 1 (limit: 4915)
     CGroup: /system.slice/apport.service
             └─9190 plymouth --ping

  dez 14 08:38:36 etm systemd[1]: Starting LSB: automatic crash report 
  dez 14 08:43:36 etm systemd[1]: apport.service: Start operation timed out. 
  dez 14 08:43:36 etm systemd[1]: apport.service: Failed with result 'timeout'.
  dez 14 08:43:36 etm systemd[1]: Failed to start LSB: automatic crash report 

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-menus 3.13.3-6ubuntu5
  ProcVersionSignature: Ubuntu 4.14.0-11.13-generic 4.14.3
  Uname: Linux 4.14.0-11-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.8-0ubuntu4
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Dec 14 09:50:52 2017
  InstallationDate: Installed on 2017-09-29 (75 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Beta amd64 (20170929)
  SourcePackage: gnome-menus
  UpgradeStatus: No upgrade log present (probably fresh install)

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