[Bug 1955109] Re: boot menu not appearing after manual install of jellyfish daily build

[ajgreeny]

I noticed this problem yesterday, 16 December 2021, but it is easy enough to overcome with an additional line added to /etc/default/grub
GRUB_DISABLE_OS_PROBER=false

There are other methods as well, adding the boot stanza of a missing OS
to /etc/grub.d/40_custom file.

You need to update grub after either edit with 
sudo update-grub

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Title:
  boot menu not appearing after manual install of jellyfish daily build

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  desktop amd64 PC, UEFI, 8 core processor, 16gb RAM, nVidia graphics
  card, several ssd's

  manual install of Kubuntu Jellyfish to a partition on ssd alongside
  Kubuntu Focal LTS

  I am testing an installation of Kubuntu Jellyfish daily build alongside Kubuntu Focal 20.04.3
  Usually this proceeds without a problem.

  Since the 16th Dec daily build of Jammy, the boot menu does not appear
  any more after installation, also booting ignores Kubuntu Focal and
  proceeds directly to Kubuntu 22.04.

  I recovered the boot menu on this PC by running boot-restore from an
  iso of Kubuntu Focal both Focal and Jelly fish are then available from
  the restored boot menu.

  This bug appears in Kubuntu Jammy after a manual install directly to
  the computer's ssd.

  I'm not an expert at bug reporting, so if this report is incorrectly set out or if more info is needed I'm happy to follow instructions.
  I'll keep an eye on this thread.
  I think the problem is with the Jammy iso, not Focal.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: grub2 (not installed)
  ProcVersionSignature: Ubuntu 5.4.0-91.102-generic 5.4.151
  Uname: Linux 5.4.0-91-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.21
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Fri Dec 17 08:24:04 2021
  InstallationDate: Installed on 2020-10-27 (416 days ago)
  InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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