'Bootable USB Ubuntu issue [closed]

all. I was trying to download Ubuntu to a new and empty USB stick, from my Mac. After just a few small hiccups, this big hiccup occurred, and I’m not sure what it means, or what to do about it:

this is something to do with grub

I unplugged my USB and turned off the computer and started up again and can only get to the screen shown. Ctrl+R led me to believe I somehow got rid of my laptop drive, because nothing showed up without the USB plugged in. When I plugged my USB back in, it showed two options, but only with the USB name for both. How should I proceed getting back to my normal laptop?



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