How to re-install system-settings?

I'm on Ubuntu 14.04 I tried to install im-switch, but it uninstalled im-config and language support, making system setting very difficult, my system-setting page becomes this

And I've re-installed Language Support and im-config using apt-get, but other settings does not come back.

How can I turn it into previous setting page?

Solution 1:

Reinstalling unity-control-center should fix the problem.

Reinstall it by executing following command in terminal

sudo apt-get remove unity-control-center
sudo apt-get install unity-control-center

Solution 2:

On Ubuntu 18.04 (and later?), one should use sudo apt-get install gnome-control-center