I have the same problem as originally described. However, I have the following message when running unity-control-center user-accounts in a terminal My messages are libwayland_ltst-client.so.0: cannot open shared object file: No such file or directory Failed to load module: /usr/lib/x86_64-linux-gnu/unity-control-center-1/panels/libuser-accounts.so In my case, libwayland_ltst-client.so.0 is not in my system. In fact it belongs to a 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. If I open Applications>Systems Settings>any other applet, they work. However, if I start User Accounts, the panel never comes up, and all apps no longer work even though their tab appears. If I try to kill the process, I have to do it over and over. I can also click the X on the window multiple times, and the window will eventually close. Here is what I get if I use the dpkg command: dpkg -s libwayland-ltst-client0 Package: libwayland-ltst-client0 Status: deinstall ok config-files Priority: optional Section: libs Installed-Size: 90 Maintainer: Ubuntu Developers