[Bug 1926090] [NEW] Conflict between old GRUB2 and newly automatically installed one

[Pavel Heinige]

Public bug reported:

I had on acer extensa 2519, 2G RAM, 500G HDD windows7 and ubuntu 18.04
and boot them via grub2 legacy (switchable to efi). As it was slow I
installed xubuntu and during installation it strongly requested efi
system partition. S I created it and then the installation process
failed as there was a conflict when it installed grub2.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15.10
ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-43-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.445.1
Date: Sun Apr 25 18:33:35 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed quiet splash ---
LiveMediaBuild: Xubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal ubiquity-20.04.15.10 xubuntu

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https://bugs.launchpad.net/bugs/1926090

Title:
  Conflict between old GRUB2 and newly automatically installed one

Status in grub-installer package in Ubuntu:
  New

Bug description:
  I had on acer extensa 2519, 2G RAM, 500G HDD windows7 and ubuntu 18.04
  and boot them via grub2 legacy (switchable to efi). As it was slow I
  installed xubuntu and during installation it strongly requested efi
  system partition. S I created it and then the installation process
  failed as there was a conflict when it installed grub2.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubiquity 20.04.15.10
  ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-43-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.445.1
  Date: Sun Apr 25 18:33:35 2021
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed quiet splash ---
  LiveMediaBuild: Xubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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