Although I completely agree that's the kernel could've automatically
chosen the working /dev/console "backend", and that would be the best
fix, this won't be fixed soon. Right now users without serial port have
unexplicable hang that is pretty hard to debug.

Having initramfs init script report broken /dev/console would help this
situation tremendously, and the fix is very easy: just add

print "$@" || echo "/dev/console appears broken"

to _log_msg, and users will at least know the source of the problem.

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https://bugs.launchpad.net/bugs/1573095

Title:
  Cloud images fail to boot when a serial port is not available

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