I'm trying to configure my Ubuntu for switching between AMD and integrated Intel graphics (I don't mind restarting my computer to acomplish the switching each time) per http://askubuntu.com/a/196644/ Unfortunately I encountered an error and I'm too n00b to punch through it further. In Solution1: After ~/acpi_call$ chmod a+x test_off.sh I get the following error: chmod: cannot access `test_off.sh': No such file or directory . No other errors up to this point.

Indeed, the location does not contain the file. How do I proceed then?