[Bug 1854058] [NEW] update-grub does not use UUID to specify root when booting other linux

[zebul666]

Public bug reported:

update-grub (/etc/grub.d/30_os_prober) does not use UUID when specifying
the root fs of a linux install in the /boot/grub/grub.cfg generated
file.

so it generates something like:

linux /boot/vmlinux-linux root=/dev/sdb5

in /boot/grub/grub.cfg in the /etc/grub/d/30_os_prober section

So it fails to boot my archlinux install because:

1. grub.cfg use /dev/sdb5
2. during early boot (sda and sdb are swapped)
3. early boot (systemd in initcpio in archlinux) tries to fsck sdb5 which is the wrong partition because it should be sda5.
4. boot fails (with emergency shell)

Fix:
30_os_prober should generate line using UUID like it does for main linux install, i.e.

linux /boot/vmlinuz-linux root=UUID=xxxxx-yyy-zzz-aaaa....

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: grub2-common 2.04-1ubuntu12.1
ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
Uname: Linux 5.3.0-23-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
Date: Tue Nov 26 14:09:38 2019
InstallationDate: Installed on 2018-05-07 (567 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: Upgraded to eoan on 2019-10-23 (34 days ago)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug eoan

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Title:
  update-grub does not use UUID to specify root when booting other linux

Status in grub2 package in Ubuntu:
  New

Bug description:
  update-grub (/etc/grub.d/30_os_prober) does not use UUID when
  specifying the root fs of a linux install in the /boot/grub/grub.cfg
  generated file.

  so it generates something like:

  linux /boot/vmlinux-linux root=/dev/sdb5

  in /boot/grub/grub.cfg in the /etc/grub/d/30_os_prober section

  So it fails to boot my archlinux install because:

  1. grub.cfg use /dev/sdb5
  2. during early boot (sda and sdb are swapped)
  3. early boot (systemd in initcpio in archlinux) tries to fsck sdb5 which is the wrong partition because it should be sda5.
  4. boot fails (with emergency shell)

  Fix:
  30_os_prober should generate line using UUID like it does for main linux install, i.e.

  linux /boot/vmlinuz-linux root=UUID=xxxxx-yyy-zzz-aaaa....

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: grub2-common 2.04-1ubuntu12.1
  ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
  Uname: Linux 5.3.0-23-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  Date: Tue Nov 26 14:09:38 2019
  InstallationDate: Installed on 2018-05-07 (567 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: Upgraded to eoan on 2019-10-23 (34 days ago)

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