In UBUNTU do the following:

Either configure your machine to boot into CLI mode (as opposed to GUI) or simply shut the GUI interface (X-Windows) down while its running. Then, working from the command line, mount another usb disk. Verify that the disk is properly mounted by writing to it.

Write down the steps you took, and submit them here along with a screenshot of the mounted disk.

please show every step you took so i can follow exactly. Thank you.