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Clicking on other settings like Displays or Keyboards works fine, the new window opens and I can change the settings. But when I click on User Accounts, it does not open, and I am unable to click on anything else, and the window will not close and stays on top. I can't use anything else until I force log out. This is 14.04.4 LTS and Unity

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This happens when you upgrade graphical stack and do not install libwayland-egl1-mesa-lts-xxxx, where xxxx is your graphical stack name.

Check which version is installed by

dpkg -l | grep xserver-xorg-core

and see which line is with ii chars

ii  xserver-xorg-core-lts-wily                            2:1.17.2-1ubuntu9.1~trusty1                         amd64        Xorg X server - core server

If it is wily, then run

sudo apt-get install libwayland-egl1-mesa-lts-wily

and the issue will be fixed.

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