GRUB command line. Have to boot manually

Question

Somehow my grub got corrupted while updating my Pop!_OS System. I rewrote the partition, grub-install, boot-repair, I tried anything.

Well, I can boot by typing the following lines.

set prefix=(hd1,gpt3)/boot/grub
set root=(hd1,gpt3)
insmod normal
normal

But I can't get grub to do it automatically. It's not "that bad", but it's really annoying to type that down everytime I boot.

Is there any config File I can use to "automate" that stuff again? Thank you in advise!

**

EDIT: I tried update-grub, grub-install. Various methods, I just don't get it.

**

Here's some basic information:

Kernel: 5.19.0-76051900-generic

Partitions:

/dev/md0p3       /
/dev/md0p4       /home
/dev/md0p1       /boot/efi

Here is a tree of my /boot directory:

.
├── config-5.18.10-76051810-generic
├── config-5.19.0-76051900-generic
├── efi
│   ├── EFI
│   │   ├── BOOT
│   │   │   ├── bkpbootx64.efi
│   │   │   └── bootx64.efi
│   │   ├── pop
│   │   │   ├── grub.cfg
│   │   │   └── grubx64.efi
│   │   ├── pop_os
│   │   │   ├── grub.cfg
│   │   │   └── grubx64.efi
│   │   └── Pop_OS-f8340379-32a0-45b0-82fa-f157f426bd50
│   │       ├── cmdline
│   │       ├── initrd.img
│   │       ├── initrd.img-previous
│   │       ├── vmlinuz.efi
│   │       └── vmlinuz-previous.efi
│   └── loader
│       ├── entries
│       │   ├── Pop_OS-current.conf
│       │   └── Pop_OS-oldkern.conf
│       └── loader.conf
├── grub
│   ├── fonts
│   │   └── unicode.pf2
│   ├── grub.cfg
│   ├── grubenv
│   ├── locale
        # Tons of locale-files
│   │   └── zh_TW.mo
│   ├── unicode.pf2
│   └── x86_64-efi
│       #Tons of .mod files
│       ├── xzio.mod
│       ├── zfscrypt.mod
│       ├── zfsinfo.mod
│       ├── zfs.mod
│       └── zstd.mod
├── grub.bak
│   ├── grub.cfg
│   └── grubenv
├── initrd.img -> initrd.img-5.19.0-76051900-generic
├── initrd.img-5.17.5-76051705-generic-nouveau
├── initrd.img-5.18.10-76051810-generic
├── initrd.img-5.19.0-76051900-generic
├── initrd.img.old -> initrd.img-5.18.10-76051810-generic
├── System.map-5.18.10-76051810-generic
├── System.map-5.19.0-76051900-generic
├── vmlinuz -> vmlinuz-5.19.0-76051900-generic
├── vmlinuz-5.18.10-76051810-generic
├── vmlinuz-5.19.0-76051900-generic
└── vmlinuz.old -> vmlinuz-5.18.10-76051810-generic

Answer 1

Firstly, I'd suggest you create a new grub cfg file by typing as a root user:

grub2-mkconfig –o /boot/grub2/grub.cfg

then, again as root user

update-grub2

Note: if update-grub2 is not present use update-grub

Answer 2

To define a new boot option for the new kernel you have installed, go to the (/boot/loader/entries) directory with root access and create a new file with the extension .conf and name this file the same as the name of the newly installed kernel, for example: ef8547eded9a4d-5.19.0-76051900-generic.conf

And then write your desired settings inside this file.

Below is an example of the settings for you:

title PopOs(Workstation)

version 5.19.0-76051900-generic

linux /vmlinuz-5.19.0-76051900-generic

initrd /initrd.img-5.19.0-76051900-generic

options root=UUID=52d3d64b-5de1-4483-9fd9-e171b7acdbe9 ro 

resume=UUID=0cb3dec1-cce5-46d6-89b6>

grub_users $grub_users

grub_arg --unrestricted

Answer 3

This happened to me when I was trying to create a Xubuntu distribution on a USB disk. I tried the sudo update-grub option given above and it didn't work. The fix for me was to boot into linux using the commands you suggest except that my root partition was (hd2,gpt2) and then I had to reinstall the grub bootloader. I used lsblk to find the name of my boot device which was /dev/nvme1n1 and then I used the install command:

sudo grub-install --boot-directory=/boot /dev/nvme1n1

I expect all this could also be done from a live Ubuntu USB disk too if there are difficulties getting linux to boot from the grub command line (finding the right disk can be tricky if you have a lot of disks). You can mount the hard disk and change the command to point to the mounted location of the boot directory.

Answer 4

i was managed my boots with efi-shell and its default hook.(it is (efiroot)/startup.nsh )

Abandon all bootloader garbages years before and happy with it.

Peoples continuously wrestling with grub. Preblems occurs frequently.

So i suggest all to learn how to manage it via (efi-shell + startup.nsh) and get rid of grub etc completely as permanent fix.

%9x of pc/laptops alredy efi enabled.(%100 new sold) Others can still use grub.

it is easy tiny bit learn not big deal. docs online every where.

edit: efi-shell available for most distros repo as binary package. most distros configure kernel as efi-stub means kernel is essentially an efi-executable file.

Booting/Dropping directly to efi-shell cannot means you lost change of recovery that bootloaders provide. You are able to create your own taste of recovery via it.