I no longer get the system-settings option on my ubuntu 12.04. I have earlier used it several times without any problem. I am not aware which action could have caused this problem but I don't remember uninstalling or deleting any package recently.
System-Settings Option Missing on Ubuntu 12.04 – How to Restore
12.04system-settings
Best Answer
The above command will install everything, which comes as default settings(software center,system settings)
This will install system-settings option