After installing Ubuntu 22.04 next to Fedora, no option to boot Fedora

[Jeremy Bícha]

Test Case 1:
------------
0. Install Fedora 36 Beta
1. Use the latest Ubuntu 22.04 daily image to install Ubuntu

Expected:
The boot menu list includes Fedora

What happens instead:
The system boots directly into Ubuntu without showing the grub screen since Ubuntu is the only available system.

Other Info
----------
I first did a default Fedora install. Whole disk. It used btrfs by default. No encryption. No LVM. No separate boot partition. There was a EFI partition when I used GNOME Boxes for this install.

When I booted Ubuntu, I had to use gparted to resize the Fedora btrfs partition since the Ubuntu installer would not prompt to do it automatically (no Install Alongside option).

I then tried the workaround to add GRUB_DISABLE_OS_PROBER=false to /etc/default/grub . When I ran sudo update-grub , Fedora still wasn't recognized.

So my guess is that Ubuntu's os-prober doesn't recognize a boot directory on a btrfs partition?

Test Case 2
-----------
Successful.
I installed Windows 11 first. Then I installed Ubuntu by choosing Install Alongside Windows. The boot menu list included Windows (and Ubuntu).

---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu80
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 22.04
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
InstallationDate: Installed on 2022-04-06 (0 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Daily amd64 (20220406)
Package: ubiquity (not installed)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30
Tags: jammy wayland-session wayland-session ubiquity-22.04.11
Uname: Linux 5.15.0-25-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jeremy Bícha (jbicha)]

This is claimed to be fixed with LP: #1955109 but it didn't seem to work in my usecase. Maybe it's not actually doing everything it needed to.

[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:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1967944

[Jeremy Bícha (jbicha)]

apport information

[Jeremy Bícha (jbicha)]

apport information

[Jeremy Bícha (jbicha)]

apport information

[Jeremy Bícha (jbicha)]

apport information

[Jeremy Bícha (jbicha)]

apport information

[Jeremy Bícha (jbicha)]

Since this appears to be out of os-prober not handling btrfs partitions, I'm marking this a duplicate of #887836