package man-db 2.7.4-1 failed to install/upgrade: triggers looping, abandoned

[nil007]

happened during 16.04 upgradation from 15.10

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: man-db 2.7.4-1
ProcVersionSignature: Ubuntu 4.2.0-17.21-generic 4.2.3
Uname: Linux 4.2.0-17-generic x86_64
ApportVersion: 2.19.2-0ubuntu3
Architecture: amd64
Date: Fri Nov 6 08:38:16 2015
DuplicateSignature: package:man-db:2.7.4-1:triggers looping, abandoned
ErrorMessage: triggers looping, abandoned
InstallationDate: Installed on 2015-11-05 (0 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
RelatedPackageVersions:
 dpkg 1.18.3ubuntu1
 apt 1.0.10.2ubuntu1
SourcePackage: man-db
Title: package man-db 2.7.4-1 failed to install/upgrade: triggers looping, abandoned
UpgradeStatus: Upgraded to xenial on 2015-11-06 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[James Banks (jb52009)]

I think that giving more of a warning about these Upgrade problems would be a great kindness to average users. Even more so a kindness to the Microsoft refugees who chose Ubuntu because it was supposed to be easy to use and "Just Work" without writing up a lot of custom scripts. If the only dependable upgrade is a complete re-installation from a DVD, then please tell us so.
Please don't prank thousands of people with that "Upgrade" button on a popup menu.

[Colin Watson (cjwatson)]

dpkg: cycle found while processing triggers:
 chain of packages whose triggers are or may be responsible:
  bamfdaemon -> bamfdaemon
 packages' pending triggers which are or may be unresolvable:
  dbus: /usr/share/dbus-1/system-services: /etc/dbus-1/system.d
  gnome-menus: /usr/share/applications
  man-db: /usr/share/man
  systemd: /etc/init.d
  libc-bin: ldconfig
  bamfdaemon: /usr/share/applications
  initramfs-tools: update-initramfs
  libgdk-pixbuf2.0-0:amd64: /usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders
  dictionaries-common: update-default-ispell: update-default-wordlist: aspell-autobuildhash
  ureadahead: /etc/init.d: /etc/init
  gconf2: /usr/share/GConf/gsettings: /usr/share/gconf/schemas
  ufw: /etc/ufw/applications.d

I think man-db is/was the victim of a dpkg bug here, so reassigning.