What to do when *nothing* will stop a mv command that did not finish

See screenshot. As you can see, I’ve tried all the things that I’ve read about to use. Nothing can kill this dang mv command. The last line with “mv: failed” has been for 12+ hours. Same thing happened yesterday with a du command. I’m on macOS, running Ubuntu Server via VirtualBox. Attempting to recover data by copying one external hard drive to another.