[Bug 1901828] Re: upgrade modifies /etc/default/grub inappropriately

[Julian Andres Klode]

** Package changed: apt (Ubuntu) => grub2 (Ubuntu)

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Title:
  upgrade modifies /etc/default/grub inappropriately

Status in grub2 package in Ubuntu:
  New

Bug description:
  If I have:
  GRUB_CMDLINE_LINUX="nomodeset"
  in /etc/default/grub, boot hangs with "Failed to start Light Display Manager". No problem, I delete the line and run update-grub.

  However, running
  apt upgrade
  sometimes appends the line
  GRUB_CMDLINE_LINUX="nomodeset"
  to /etc/default/grub, resulting in a failed boot after upgrade. I am sure it is appending the line to the file because the rest of the file is unchanged.
  This has been happening occasionally for a long time. Most recently, it happened when I used
  do-release-upgrade
  to go from 18.04 to 20.04
  I guess some package thinks it is a good idea to add this option, but I don't know which one, or how to stop it.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: apt 2.0.2ubuntu0.1
  ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
  Uname: Linux 5.4.0-52-generic x86_64
  NonfreeKernelModules: talpa_vfshook talpa_pedconnector talpa_pedevice talpa_vcdevice talpa_core talpa_linux talpa_syscallhook
  ApportVersion: 2.20.11-0ubuntu27.10
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Oct 28 16:51:45 2020
  InstallationDate: Installed on 2017-06-29 (1217 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  SourcePackage: apt
  UpgradeStatus: Upgraded to focal on 2020-10-24 (4 days ago)

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