Serial console output for Autoinstall option

I have been experimenting with the autoinstall procedure and after waiting some time for output when I first booted into it, I realised it most likely wasn't sending anything to serial console. Since this process takes quite some time and can fail quickly if there is an error in the answer file, serial console output is a vital fallback for servers that don't have other means of connectivity,

Modifying the Autoinstall command-line to include `console=ttyS0,115200` works as expected, but of...

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