See reply #20 as to location of libwayland_ltst-client.so.0. That says In my case, libwayland_ltst-client.so.0 is not in my system. In fact it belongs to the package libwayland-ltst-client0 that is a Precise upgrade of the HWE to the Trusty stack. I upgraded from 12.04.5 -> 14.04.1. So I cannot understand why libwayland_ltst-client.so.0 is being called. As further explanation, I upgraded the HWE stack while still on Precise. That had libwayland_ltst-client.so.0 as part of the package. When I upgraded to Trusty, that package was removed. However, it seems unity-control-center user-accounts still expects the package to be present as it is calling libwayland_ltst-client.so.0. Something was obviously not upgraded properly, but I have no idea what that may be. dpkg -s unity-control-center gives the following: Package: unity-control-center Status: install ok installed Priority: optional Section: gnome Installed-Size: 4112 Maintainer: Ubuntu Desktop Team