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I am no Ubuntu expert (I use Arch Linux/pacman instead of Ubuntu/apt) but it looks like it might be a harmless error message indicating a failure to properly retrieve the list of packages available for download.
The monitor thing is almost definitely unrelated. And I have no idea why the monitor would say no input -- it should certainly show the BIOS menu even before booting. And that firmware is low-level and pretty foolproof.
Maybe check the cable connection?
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