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[Launchpad Bug Tracker <1889556@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package grub2 - 2.04-1ubuntu26.2

---------------
grub2 (2.04-1ubuntu26.2) focal; urgency=medium

  * debian/postinst.in: Avoid calling grub-install on upgrade of the grub-pc
    package, since we cannot be certain that it will install to the correct
    disk and a grub-install failure will render the system unbootable.
    LP: #1889556.

 -- Steve Langasek <steve.langasek@xxxxxxxxxx>  Thu, 30 Jul 2020
17:34:25 -0700

** Changed in: grub2 (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1889556

Title:
  grub-install failure does not fail package upgrade (and does not roll
  back to matching modules)

Status in grub2 package in Ubuntu:
  Fix Committed
Status in grub2 source package in Xenial:
  Fix Released
Status in grub2 source package in Bionic:
  Fix Released
Status in grub2 source package in Focal:
  Fix Released
Status in grub2 source package in Groovy:
  Fix Committed

Bug description:
  [SRU Justification]
  SRU regression triggered by latent misconfiguration of grub on the host system, leading to a failure to boot due to ABI mismatch between /boot/grub/i386-pc which is updated, and the grub image in the MBR which is not

  [Test case]
  1. Boot a system in BIOS mode.
  2. Run sudo sed -i -e'/Name: grub-pc\/install_devices/,/Name/ s,Value: .*,Value: /dev/non-existent,' /var/cache/debconf/config.dat
  3. Enable -proposed in apt sources.list.
  4. Run sudo env DEBIAN_FRONTEND=noninteractive apt install grub-pc
  5. Reboot
  6. Confirm that the system boots successfully
  7. Boot a system in UEFI mode.
  8. Enable -proposed in apt sources.list.
  9. Run sudo env DEBIAN_FRONTEND=noninteractive apt install grub-efi-amd64-signed
  10. Confirm that the contents of /boot/efi/EFI/ubuntu have been updated with the current timestamp.

  [Original description]
  Failure to install new grub core to the specified device does not correctly prevent upgrade to incompatible modules (LP: #1889509)

  $ sudo debconf-get-selections |grep sda
  grub-pc	grub-pc/install_devices_disks_changed	multiselect	/dev/sda
  grub-pc	grub-pc/install_devices	multiselect	/dev/sda

  $ mount|grep nvme
  /dev/nvme0n1p1 on / type ext4 (rw,relatime,discard,data=ordered)

  $ ls /dev/sda
  ls: cannot access '/dev/sda': No such file or directory

  $ sudo env DEBIAN_FRONTEND=noninteractive apt full-upgrade -y
  ...
  Get:10 http://us-west-2.ec2.archive.ubuntu.com/ubuntu xenial-updates/main amd64 grub-pc-bin amd64 2.02~beta2-36ubuntu3.26 [891 kB]
  ...
  Installing for i386-pc platform.
  grub-install: error: cannot find a GRUB drive for /dev/sda.  Check your device.map.
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-4.4.0-1111-aws
  Found linux image: /boot/vmlinuz-4.4.0-1109-aws
  Found initrd image: /boot/initrd.img-4.4.0-1109-aws
  done
  ...

  # update-grub failed during the install but the return code is 0
  $ echo $?
  0

  # The package is installed without apparent error, but the instance will fail to reboot (LP: #1889509)
  $ dpkg -l|grep grub-pc
  ii  grub-pc                          2.02~beta2-36ubuntu3.26                    amd64        GRand Unified Bootloader, version 2 (PC/BIOS version)
  ii  grub-pc-bin                      2.02~beta2-36ubuntu3.26                    amd64        GRand Unified Bootloader, version 2 (PC/BIOS binaries)

  # If I reboot it will fail to boot:
  Booting from Hard Disk 0...
  error: symbol `grub_calloc' not found.
  Entering rescue mode...
  grub rescue> _

  ---

  Xenial in AWS (us-west-2 ami-060d1be0dd4526759 built on 20200611)
  The  debconf for grub was not set to the correct device when cloud-init first ran (LP: #1877491) or when the fix for that was applied (LP: #1889555)
  The fact that grub-install fails during the upgrade but does not fail the package install (and cause a rollback) means that how we have a mismatch between grub core and modules which breaks boot (LP: #1889509).

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