sir, i am using ubuntu 16.04 on linux ,would you please help me i really stuck at this problem. And after i used "reboot" in terminal ,it began to shutdown. But it does not works fine. it says "your system is running in low graphics mode", and also it says "you need to reconfigure yourself". Please help me after this i am facing problem "please give me steps to fix this error"… Thankinking you sir.