lubuntu install; dual boot system but no grub was offered thus can't boot other ubuntu installation

[Chris Guiver]

Lubuntu mantic re-install of OS on dual boot system.

- hp dc7700 (c2d-e6320, 8gb amd/ati rv610/radeon hd2400 pro/xt)

sda5 (no format re-install; dual boot system)
this install has data files added, additional packages added; system installed is Ubuntu MATE 23.04

** Expected outcome

On reboot after install, I expected to be offered GRUB MENU with two options; prior install & this new install

** Actual outcome

On reboot this system booted without offering me choice to select which system I wanted to boot

Package `calamares` selected; but maybe GRUB related issue !

On first boot - I ran `update-grub` & output is
---
guiverc@dc7700-1:~$ sudo update-grub
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Sourcing file `/etc/default/grub.d/lubuntu-grub-theme.cfg'
Generating grub configuration file ...
Found theme: /usr/share/grub/themes/lubuntu-grub-theme/theme.txt
Found linux image: /boot/vmlinuz-6.2.0-21-generic
Found initrd image: /boot/initrd.img-6.2.0-21-generic
Found linux image: /boot/vmlinuz-6.2.0-20-generic
Found initrd image: /boot/initrd.img-6.2.0-20-generic
Found memtest86+x64 image: /boot/memtest86+x64.bin
Warning: os-prober will not be executed to detect other bootable partitions.
Systems on them will not be added to the GRUB boot configuration.
Check GRUB_DISABLE_OS_PROBER documentation entry.

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: calamares (not installed)
ProcVersionSignature: Ubuntu 6.2.0-21.21-generic 6.2.6
Uname: Linux 6.2.0-21-generic x86_64
ApportVersion: 2.26.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: LXQt
Date: Tue Jun 6 17:24:26 2023
InstallationDate: Installed on 2023-06-06 (0 days ago)
InstallationMedia: Lubuntu 23.10 "Mantic Minotaur" - Daily amd64 (20230605)
SourcePackage: calamares
UpgradeStatus: No upgrade log present (probably fresh install)

[Chris Guiver (guiverc)]

FYI: This install looks correct..

Like yesterday's install... audacious failed to run post-install, but worked correctly once packages were full-upgraded.

audacious continued playing with the track I'd started earlier today (when added in the ubuntu-mate 23.04 install that this install overwrote... it was the 4th random-order track I selected so unlikely just 'random'... it also continued playing at approx where I'd shutdown rather than from start). bad joke from fortune|cowsay etc...

so install looks good EXCEPT FOR LOSS OF DUAL BOOT option due to grub OS_PROBER issue.

We've had this issue before (during alpha stage; jammy I think) & it can be dealt with via documentation if necessary.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
https://iso.qa.ubuntu.com/qatracker/reports/bugs/2023005