[Bug 1887373] Re: upgrade from 18.04 to 20.04 hangs on lvm2 snapshot

[Denny]

https://askubuntu.com/questions/1257667/upgrade-18-04-to-20-04-hangs-
after-adding-boot-menu-entry-for-efi-firmware-conf

as is apparent from the link, there is at least one other person
affected by this.

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https://bugs.launchpad.net/bugs/1887373

Title:
  upgrade from 18.04 to 20.04 hangs on lvm2 snapshot

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

Bug description:
  When trying to upgrade my Kubuntu 18.04 to Kubuntu 20.04 by running

  sudo do-release-upgrade -d

  I get at a point where the installer reads:

  ...
      File descriptor 3 (pipe:[366994]) leaked on vgs invocation. Parent ID 31982: /usr/sbin/grub-probe

  ...
  grub-probe: error: unknown filesystem.
      File descriptor 3 (pipe:[366994]) leaked on vgs invocation. Parent ID 31982: /usr/sbin/grub-probe
  ...

  Found Ubuntu 18.04.4 LTS (18.04) on dev/,apper/kubuntu--vg-snap
  Adding boot menu entry for EFI firmware configuration
  done
  ...

  At this point the installer hangs for at least 35 min. Killing it and
  restarting leads to a kernel panic.

  
  This is on a laptop with lvm2, using an lvm snapshot before the upgrade

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