[Bug 2106764] Re: Residual configuration of grub-pc not removed during Ubuntu 25.04 installation

[Cristiano Fraga G. Nunes]

** Also affects: ubiquity (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: grub2 (Ubuntu)

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Title:
  Residual configuration of grub-pc not removed during Ubuntu 25.04
  installation

Status in ubiquity package in Ubuntu:
  New

Bug description:
  During the installation of Ubuntu 25.04 on a UEFI system, the
  installer correctly installs the grub-efi-amd64 package. However, the
  residual configuration files for the grub-pc package are left on the
  system.

  If the user runs the command:
  sudo apt remove grub-pc --purge

  after installation, this results in the removal of the GRUB
  bootloader, leading to a non-bootable system.

  **Steps to Reproduce:**

  1. Install Ubuntu 25.04 on a UEFI system.
  2. Complete the installation and boot into the system.
  3. Run dpkg -l | grep grub and observe that both grub-pc (residual config) and grub-efi-amd64 are listed.
  4. Run sudo apt remove grub-pc --purge.
  5. Reboot the system - the bootloader is missing, and the system fails to boot.

  **Expected Behavior:**

  The installer should completely remove grub-pc and its configuration
  during installation on UEFI systems.

  Alternatively, purging grub-pc post-install should not interfere with
  the functioning of grub-efi-amd64.

  **Actual Behavior:**

  Residual grub-pc configuration remains.

  Purging it removes or interferes with the EFI GRUB setup.

  The system becomes unbootable after reboot.

  ProblemType: Bug
  DistroRelease: Ubuntu 25.04
  Package: grub2 (not installed)
  ProcVersionSignature: Ubuntu 6.14.0-15.15-generic 6.14.0
  Uname: Linux 6.14.0-15-generic x86_64
  ApportVersion: 2.32.0-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Apr 10 14:27:38 2025
  InstallationDate: Installed on 2025-04-04 (6 days ago)
  InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Beta amd64 (20250326.6)
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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