Public bug reported:
I have Manjaro Linux 18.0.4 installed and then recently installed Ubuntu
19.04 on another partition. After the Ubuntu install the Ubuntu created
GRUB boot menu includes entries for booting Manjaro but they aren't
functional. It is repeatable after install too, If I run update-grub2
from Ubuntu the prober finds Manjaro and adds boot entries but they are
flawed in the same way. Namely the entries for booting Manjaro in the
original Manjaro created grub.cfg contain:
linux /vmlinuz-4.19-x86_64
root=UUID=c6b7b62a-66d5-45ef-89dd-4f06ec8e6cbe rw
initrd /amd-ucode.img /initramfs-4.19-x86_64.img
but the entries in the Ubuntu created grub.cfg contain:
linux /vmlinuz-4.19-x86_64
root=UUID=c6b7b62a-66d5-45ef-89dd-4f06ec8e6cbe rw
initrd /amd-ucode.img
The second initrd file goes missing. Thus if I try to boot using the Ubuntu
created entry for Manjaro I hit
"Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)"
... immediately at the beginning of boot.
I tracked the problem down to /usr/lib/linux-boot-probes/mounted/40grub2 line #
81
initrd="$(echo "$2" | sed 's/(.*)//')"
>From what I can tell the purpose of this is to strip GRUB style partition
>specifier prefix like "(hd0,1)" however it makes the assumption that the
>original initrd line it discovered in probing only contains a single file.
I am able to fix this behavior and make the Manjaro entry of the Ubuntu
generate GRUB menu bootable if I change the "40grub2" prober and "30_os-prober"
code as follows...
(borrows from the Manjaro version)
$ diff /usr/lib/linux-boot-probes/mounted/40grub2.original
/usr/lib/linux-boot-probes/mounted/40grub2
81,82d80
< initrd="$(echo "$2" | sed 's/(.*)//')"
< # Initrd same.
84c82,84
< initrd="/boot$initrd"
---
> initrd="$(echo "$line" | sed
> 's/initrd//;s/\t//;s|/|/boot/|g;s/(.*)//')"
> else
> initrd="$(echo "$line" | sed
> 's/initrd//;s/\t//;s/(.*)//')"
$ diff /etc/grub.d/30_os-prober.original /etc/grub.d/30_os-prober
246c246
< LINITRD="`echo ${LINUX} | cut -d ':' -f 5`"
---
> LINITRD="`echo ${LINUX} | cut -d ':' -f 5 | tr '^' ' '`"
ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: os-prober 1.74ubuntu1 [modified: usr/bin/linux-boot-prober]
ProcVersionSignature: Ubuntu 5.0.0-25.26-generic 5.0.18
Uname: Linux 5.0.0-25-generic x86_64
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Aug 16 10:03:03 2019
InstallationDate: Installed on 2019-08-15 (1 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: os-prober
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: os-prober (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug disco
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https://bugs.launchpad.net/bugs/1840477
Title:
Probed linux entries not bootable if original initrd line has more
than one file
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