[Bug 1854839] [NEW] Fresh Bionic install hangs forever at 66% waiting for os-prober

[Evan Hoffman]

Public bug reported:

Installing Ubuntu 18.04 cleanly on boxes that have 14.04, the installer
hangs at the end during "update grub" at 66%, forever, until I switch to
another console and kill the pid of "dmsetup".  Issue is described in
more detail here: https://jrs-s.net/2019/05/31/ubuntu-18-04-hung-at-
update-grub-66/  .  I am doing a netboot preseed install using the
4.15.0-62 kernel and initrd from October 2019.  When provisioning ~15
boxes at a time, 90% - 100% of them are afflicted by this.  If I power
cycle them and PXE them into the installer again when hung they usually
run to completion.

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1854839

Title:
  Fresh Bionic install hangs forever at 66% waiting for os-prober

Status in debian-installer package in Ubuntu:
  New

Bug description:
  Installing Ubuntu 18.04 cleanly on boxes that have 14.04, the
  installer hangs at the end during "update grub" at 66%, forever, until
  I switch to another console and kill the pid of "dmsetup".  Issue is
  described in more detail here:
  https://jrs-s.net/2019/05/31/ubuntu-18-04-hung-at-update-grub-66/  .
  I am doing a netboot preseed install using the 4.15.0-62 kernel and
  initrd from October 2019.  When provisioning ~15 boxes at a time, 90%
  - 100% of them are afflicted by this.  If I power cycle them and PXE
  them into the installer again when hung they usually run to
  completion.

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