[Bug 1157065] Re: preseed install fails with "The username you entered (root) is reserved.."

[Max Brustkern]

The preseed is packed into the initrd by utah.  For d-i images, putting
preseed.cfg at the root of the initrd seems to do the trick.  For
casper/ubiquity, we use a casper-bottom script to copy preseed.cfg into
the root of the live filesystem before pivoting into it.  I can get you
more details if necessary, but as Martin indicated, we've been using
this technique for a while now without issue.  Additionally, I'm using a
preseed with a slightly stronger password that's still having the
problem, if that makes a difference.

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https://bugs.launchpad.net/bugs/1157065

Title:
  preseed install fails with "The username you entered (root) is
  reserved.."

Status in “ubiquity” package in Ubuntu:
  Confirmed

Bug description:
  I'm getting an "The username you entered (root) is reserved for use by
  the system." error (see the screenshot) while trying to install from
  preseed. I'll attach some more logs (with ubiquity-debug).

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