Help 4 Linux

PROBLEM: All operating systems freeze some times and Ubuntu is no exception. What should I do when: A program stops responding? Nothing responds to mouse clicks or key presses? cursor stops moving entirely? What things can I try before hard rebooting the machine? SOLUTIONS: When a single program stops responding: When a single program stops responding mostly we can close it by clicking on the X  shaped close button on the top right corner of the window.We will get a dialog box saying that  the program is not responding and you may press force stop or wait for the application to respond. You can also kill an application using xkill. Press ALT +  F2 and type xkill and press Enter . Now the mouse cursor will turn into an X.  Click on the non responsive window to close it. When the mouse stops working: If the keyboard still works, press ALT + F2 and type gnome-teminal . From there you can start to troubleshoot things. If you want to try restarting the GUI run sudo s...

Do not run this command unless you are prepared for a system crash! This command is called as a forkbomb. Only type this in a terminal if you are prepared for a crash. It's better to try it in a virtual machine: :(){ :|: & };:     :() defines a function called : {:|: &}; means run the function : and send its output to the : function again and run that in the background. This function will run again and again until you run out of system resources and this forces your computer to restart.