Nope, processor.nocst=1 does not help. It still hangs reading the CPU
info and that's it. The only way to boot the mac-type images in such
state is using nr_cpus=1 in the boot options, which is pretty far from
optional... I honestly don't remember how that happened but a few weeks
ago I was stuck in this loop and eventually I just shut down my Macbook
Air and in the next morning it was working again after the nr_cpus and
processor.nocst tricks I've tried the night before. I wonder if a
"clean" shut down after a successful boot cleans something up?

Anyway, I had this problem again today and I'm not running with a single
core... until I have the time to back up and install the regular image
from the site, not the crippled mac-type one. That's some really poor
phrasing on the web site, it's getting people's machines in a broken
state because it's not clear at all which image they should be
downloading.

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https://bugs.launchpad.net/bugs/1284085

Title:
  unable to boot after install on 2013 macbook air

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