Ubuntu live USB stuck on i8042: No controller found

I had a Ubuntu live USB that worked fine on a MacBook Air. I tried to boot it on a Mac Pro, and it seemed to get stuck on [sdb] Assuming drive cache: write through, but the real first error was the one that needed fixing, and it was i8042: No controller found.

I finally found the fix on Ask Ubuntu, which is to—when the live USB boots up—press e to edit the Grub line, then replace quiet splash with

i8042.nomux=1 i8042.reset nomodeset
Press F10 to boot from the edited line, and it should work just fine.

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