[Bug 1947121] [NEW] do-release-upgrade misidentifies boot disk

[Ed Broadley]

Public bug reported:

I ran do-release-upgrade to update Ubuntu 18.04 to 20.04. This was done
remotely, so it was important that the system could boot up again.

At the point it tries to install grub to the MBR it fails as it
incorrectly identifies a USB connected drive as the boot drive. The USB
connected drive is /dev/sda, whereas the boot drive, where the MBR
needed to be updated, was /dev/sdb.

I do not know yet if the system can boot, but I ended up using a 3rd
party app called boot-repair, which deals with this situation better by
offering to install grub to the MBR of all detected disks.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.32
ProcVersionSignature: Ubuntu 4.15.0-143.147-generic 4.15.18
Uname: Linux 4.15.0-143-generic x86_64
NonfreeKernelModules: lkp_Ubuntu_4_15_0_143_147_generic_81
ApportVersion: 2.20.11-0ubuntu27.17
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
Date: Thu Oct 14 08:38:56 2021
PackageArchitecture: all
ProcEnviron:
 TERM=screen.xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2021-10-14 (0 days ago)
VarLogDistupgradeXorgFixuplog:
 INFO:root:/usr/bin/do-release-upgrade running
 INFO:root:No xorg.conf, exiting

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade focal uec-images

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https://bugs.launchpad.net/bugs/1947121

Title:
  do-release-upgrade misidentifies boot disk

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

Bug description:
  I ran do-release-upgrade to update Ubuntu 18.04 to 20.04. This was
  done remotely, so it was important that the system could boot up
  again.

  At the point it tries to install grub to the MBR it fails as it
  incorrectly identifies a USB connected drive as the boot drive. The
  USB connected drive is /dev/sda, whereas the boot drive, where the MBR
  needed to be updated, was /dev/sdb.

  I do not know yet if the system can boot, but I ended up using a 3rd
  party app called boot-repair, which deals with this situation better
  by offering to install grub to the MBR of all detected disks.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.32
  ProcVersionSignature: Ubuntu 4.15.0-143.147-generic 4.15.18
  Uname: Linux 4.15.0-143-generic x86_64
  NonfreeKernelModules: lkp_Ubuntu_4_15_0_143_147_generic_81
  ApportVersion: 2.20.11-0ubuntu27.17
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  Date: Thu Oct 14 08:38:56 2021
  PackageArchitecture: all
  ProcEnviron:
   TERM=screen.xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2021-10-14 (0 days ago)
  VarLogDistupgradeXorgFixuplog:
   INFO:root:/usr/bin/do-release-upgrade running
   INFO:root:No xorg.conf, exiting

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