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

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