I am trying to boot from a USB key a desktop that normally runs (fine) Ubuntu 18.04 off a hard drive. I have modified the BIOS options to allow for USB booting and I indeed get the initial menu from the USB key (something like "boot Ubuntu live", "install Ubuntu", etc.) -- so the system sees the USB key and boots from it. Selecting the option to boot from the USB key, the system then hangs. I see the USB key light flash for a while and then nothing, either on the USB key or on screen. What could possibly go wrong and how could I fix it?
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