Comment 7 for bug 1576539

Hit this same problem while upgrading from 15.10 to 16.04 using the GUI distribution upgrader.

During upgrade I got a dialog reporting the gconf2 dependency problem. The terminal indicates this happened on unpacking the inkscape package. See upper screenshot of attached image.

The upgrade process continued but the upgrader bailed out on processing triggers for the dbus package reporting "Could not install upgrades". See lower screenshot of attached image. The terminal reported "Error in function:".

After this the upgrader closed and running the update-notifier asked me to reboot the system. Manual inspection of the package state using dpkg and further dpkg --configure -a invocations persuaded me that the system was relatively intact and a reboot was done.

The system booted nicely and seems fine now except I receive a CRT configuration error dialog when logging in on the display manager.

Runnnig dpkg --audit returns nothing and the packages that were mentioned during upgrade seems ok:

$ dpkg -l gconf2 dbus inkscape
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-=======================-================-================-===================================================
ii dbus 1.10.6-1ubuntu3. amd64 simple interprocess messaging system (daemon and ut
ii gconf2 3.2.6-3ubuntu6 amd64 GNOME configuration database system (support tools)
ii inkscape 0.91-7ubuntu2 amd64 vector-based drawing program