[Bug 1879496] Re: upgrade-from-grub-legacy: environment variable DPKG_MAINTSCRIPT_NAME is required

[Brian Murray]

** Also affects: grub2 (Ubuntu Groovy)
   Importance: Undecided
       Status: Confirmed

** Tags removed: groo rls-gg-incoming
** Tags added: groovy

** Changed in: grub2 (Ubuntu Groovy)
   Importance: Undecided => Medium

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Title:
  upgrade-from-grub-legacy: environment variable DPKG_MAINTSCRIPT_NAME
  is required

Status in grub2 package in Ubuntu:
  Confirmed
Status in grub2 source package in Groovy:
  Confirmed
Status in grub2 package in Debian:
  Fix Released

Bug description:
  I just ran into this when upgrading a xenial system to grub2.  Problem
  is known and fixed in grub2 2.04-4 in Debian.  Patch needs to be
  backported to groovy, focal, bionic and xenial.

  This is what it looks like (or visit the Debian bug):

  # upgrade-from-grub-legacy
  [...]
  Found initrd image: /boot/initrd.img-3.13.0-169-generic
  done
  dpkg-maintscript-helper: error: environment variable DPKG_MAINTSCRIPT_NAME is required
  # echo $?
  1

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