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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1840477 Title: Probed linux entries not bootable if original initrd line has more than one file To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/os-prober/+bug/1840477/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs