[Bug 1788740] Re: Upgrade from 16.04 to 18.04 failed with authentication error

[Aurosutru]

I've started afresh from an .iso and am sending this from 18.04.1, so I
don't have any more data on this problem.  I suppose this bug can be
closed.

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https://bugs.launchpad.net/bugs/1788740

Title:
  Upgrade from 16.04 to 18.04 failed with authentication error

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Attempting an online upgrade of 16.04 Ubuntu Desktop 64-bit to 18.04
  did not go well.  Initially I was prompted to make 6 GB of space
  available for the upgrade but as the online process proceeded the 9GB
  of space I provided was completely consumed and the upgrade left my
  system in an unstable state.  After some attempts to make more space
  the packages that had been downloaded and mainly installed disappeared
  from var and 5GB of space became available.

  The next problem was with authentication during startup.  The login
  screen showed two users: me and slurm - very clever, but somehow not
  amusing.  I'll be happy to help track down this bug by sending more
  info and files if need be.  My Ubuntu system is not startable but I
  can copy files using a dual boot Fedora installation.

  Another user had the same problem and reported it on the Ask Ubuntu
  Stack Exchange though he didn't mention having the slurm addition to
  his user list during login attempts:

  https://askubuntu.com/questions/1061969/authentication-error-after-
  upgrade-from-16-04-to-18-04

  Like him I'm planning to start fresh with an .iso download of 18.04
  unless someone can suggest a fix that works.  Not being able to access
  the Internet from recovery mode makes most fixes impossible and the
  other options in recovery mode haven't helped either.  Because this
  bug involves the strange addition of an unknown user I've marked it as
  a possible security issue.

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