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:
gconf2: /usr/share/GConf/gsettings: /usr/share/gconf/schemas
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
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