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dionode
Asked: 2020-08-06 23:25:25 +0800 CST

Update-grub links to incorrect partition

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I've got two installations of Ubuntu 18.04 on my computer. Ideally I just want one but when I run sudo update-grub it keeps updating the configuration for the wrong partition. I eventually want to delete the second partition but don't want to do so until I can relink my main partition with grub.

> sudo update-grub
Sourcing file `/etc/default/grub'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.4.0-42-generic
Found initrd image: /boot/initrd.img-5.4.0-42-generic
Found linux image: /boot/vmlinuz-5.3.0-28-generic
Found initrd image: /boot/initrd.img-5.3.0-28-generic
Found linux image: /boot/vmlinuz-4.15.0-112-generic
Found initrd image: /boot/initrd.img-4.15.0-112-generic
Found Ubuntu 18.04.4 LTS (18.04) on /dev/nvme0n1p6
Adding boot menu entry for EFI firmware configuration
done

The partition I want to delete is /dev/nvme0n1p6. And the one I want to keep and link with grub is /dev/nvme0n1p1 but it doesn't seem to be detected. Is there a way to safely change configurations so that it updates grub for /dev/nvme0n1p1? I will eventually delete /dev/nvme0n1p6 if it is save to do so.

Edit: I tried to the suggested post askubuntu.com/questions/1168713/ (I know it's for non-UEFI) and got the output below when running on /dev/nvme0n1p6 (partition I want to delete).

$ sudo dpkg-reconfigure grub-pc
[sudo] password for dionode: 
Sourcing file `/etc/default/grub'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.4.0-42-generic
Found initrd image: /boot/initrd.img-5.4.0-42-generic
Found linux image: /boot/vmlinuz-5.3.0-28-generic
Found initrd image: /boot/initrd.img-5.3.0-28-generic
Found Ubuntu 18.04.4 LTS (18.04) on /dev/nvme0n1p1
Adding boot menu entry for EFI firmware configuration
done

Sudo update-grub from this same partition also contains that line Found Ubuntu 18.04.4 LTS (18.04) on /dev/nvme0n1p1 so it looks like update-grub from each partition only finds Ubuntu for the other partition. Is that normal?

grub2 boot partitioning

1 Answers

  1. Best Answer

    Turns out the problem was with multiple grub installations so one of them was effectively not being used. I managed to save this problem by following the post askubuntu.com/questions/1168713 which was directed at non-UEFI systems but turns out to work for UEFI systems too.

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