Questions tagged [grub2]

GRUB2 is the second revision of the GRand Unified Bootloader, with versions numbered 1.9x and 2.yz.

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Linux From Scratch/LFS 11.0 Systemd kernel boots to black screen

I have a new build of LFS 11.0-systemd on a bare metal Thinkpad X250. Everything is compiled and setup with Fedora 36 as the host system. I'm using BIOS boot mode. The system boots to GRUB, but when I ...
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Kernel Panic: VFS cannot open root device or unknown block - Linux - LFS 11.0

First of all I understand there are many similar questions had been asked on many forms but those all are really not helping in my case. I'm using Ubuntu 20 on vmware workstation. in that vmware I ...
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Grub bootloader broke after Windows 10 install on dual boot (2 drive) ZBook

My Linux drive will no longer boot. I have a dual boot ZBook. RHEL 7.9 workstation and Windows 10 Pro. Windows crashed and I reinstalled it. I removed the linux drive before I installed Win10? My grub ...
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Why does Windows 11 change the UEFI boot order?

I am dual booting a Dell Precision 7520 with Fedora 35 and Windows. Worked fine with Windows 10. "Up"graded to Windows 11 and now every time I boot into W11 it puts its own boot loader ahead ...
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The grub doesn't update in fedora and windows dualboot

I can't update the grub of Fedora to show Windows 10 in. I tried sudo grub2-mkconfig -o /boot/grub2/grub.cfg and sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg with the same output Generating ...
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os-prober can't find Windows 10

I have two hard drives, one with Ubuntu 22 (Jammy) and a separate drive with Windows 10. System boots to Ubuntu by default, as set in BIOS. I'm trying to get my grub boot menu to list the Windows 10 ...
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Grub install with encrypted Boot partition

i am trying to do arch(or any distro)-install with encrypted boot partition(lvm - uefi) during installation i am trying really hard to get it to working but i get this error i searched a lot but i ...
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What changed from Linux Kernel 5.9 to 5.10?

I use a Measurement Computing DAQ in Ubuntu to perform continuous analog reads and writes from another system connected to the board. I have been using Ubuntu 16.04 (which went up to Linux kernel 4.15)...
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Kernel doesn't seem to be signed for Secureboot. (linux-image-5.17.5-76051705-generic )

I've been trying to get secure boot enabled but don't manage to do it. I have installed shim and Grub correctly with sudo apt install shim-signed && sudo grub-install However, when I boot, I ...
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grub not working with lvm

I have a dualbooted system with windows + ubuntu on LVM: /dev/sda1 -> efi /dev/sda2-4 -> windows /dev/sda5 -> LVM /dev/vgsys/root -> / /dev/vgsys/home -> /home The drive it was on ...
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boot from usb stick without the grub prompt

For some reason today when I went to boot from the usb stick the grub prompt opened up. The process is the following: I turn on the pc, open the boot menu, select to boot from the usb stick and then ...
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Can't load self-signed kernel with Secure Boot on: "bad shim signature"

I'm running ubuntu with Secure Boot on. Everything works fine when I use a kernel that comes packaged from cannonical. Still, I have issues running a self-signed kernel. I'm pretty sure my signature ...
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Error when booting removable arch install

I have installed Arch Linux on an external HDD, and when I try booting into through grub which was installed on my pc through EndeavourOS it gives error: no such device: xxxxxxxxxxxxxx(UUID for my ...
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Add Windows 11 to Grub after Kali installation

I have a PC with Windows 11 on a disk (/dev/sdb) and I installed Kali on another disk (/dev/sda). Now I can't boot on Windows because there is no entry in the Grub menu. Here is the result of fdisk -l:...
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Dualboot mint and windows 10 - Could not create a variable. Out or Resources

sda1 - Windows efi, sda4 - Mint efi (as second installed) For some time now, the laptop turns on when power is applied (even though this option in UEFI is disabled). Since two days UEFI doesn't save ...
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How do i configure my PXE boot server to boot Windows PE?

I would like some advice. I run a PXE server to install multiple versions of Linux without a hitch. The way the PXE server is setup is as follows: boot client PC from network client PC downloads ...
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OpenSUSE not showing up on EFI boot menu after Tumbleweed update (Btrfs with LUKS)

The issue: A few days ago, I updated OpenSUSE tumbleweed and didn't remember seeing anything out of the ordinary. However, when I tried to reboot my computer it went into rEFInd fine but when OpenSUSE ...
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Minimal boot grub settings to run inside qemu

I am running terminal only (arch-linux) distro under Quemu on mine raspberry pi4 mostly as a shortcut to access some tools not available on aarch64 (tried to make mine own packages to port them, but ...
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EFI partition empty after grub-install

After running into a weird issue with my Linux Mint install, I decided that the easiest fix was to re-install it. After a re-install I had nothing but a BusyBox shell, and decided that it was probably ...
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What does it mean when UEFI boot option returns immediately without doing anything?

Update for Answer For anyone who wants the authoritative source see section 13.3.1.3 of the standard which describes the directory structure. Objective Make a UEFI bootable Ubuntu Linux USB drive with ...
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How do I change the name of the OS entry in GRUB?

I wanted to create my own operating system, so I created a distro image with archiso. It's pretty cool! I created a python file that helps to automate the installation of my distro. And there is the ...
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Grub find FreeDos but can not load it

I installed FreeDos 1.3 in one hard and Debian 11 on another hard. at the first Grub does not recognize FreeDos but after #grub-mkconfig command and installing grub with grub-install and update-grub ...
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Install grub on disk image with non-native platform

I'm running Ubuntu Server ARM (20.02) and I need to install GRUB on a disk image. However, the disk image is for an OS using x86_64. The disk image is attached to /dev/loop6. The Fat32 partition on ...
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initrd /casper/initrd: verbose output

In my previous question: grub2: error: can't allocate initrd - chainload an NTFS partition from FAT32 without errors on initial ramdisk (initrd) file I posted the error output: error: can't ...
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grub2: error: can't allocate initrd - chainload an NTFS partition from FAT32 without errors on initial ramdisk (initrd) file

The OS with Ubuntu 20.04.3 LTS Desktop 64-bit is located in the gpt2 partition with the filesystem NTFS. This is the structure of the gpt1 partition with the filesystem FAT32: . ├── boot │   └── grub │...
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Fix grub to boot correctly into CentOS

I had a dual-boot computer with windows and CentOS 8 [A] on it, each one in different partitions. I created a new partition and successfully installed CentOS Stream [B] on it, but now I'm unable to ...
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Unable to boot to Windows 10 after installing Centos 7 x_86-64 minimal

I have been trying to install CentOS x_86-64 minimal atop windows 10 & it went into a complete mess with lots of issues the first and foremost being unable to see an option for dual boot for ...
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Can't boot into grub menu

Grub-probe: error: cannot find a Grub drive for /dev/sda1 Chack your device.map Drive - ssd. UEFI - boot Dist - backbox After making device map still getting same error Grub-probe: error: cannot find ...
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Grub w/Kali Linux Dual Boot not working after Motherboard replacement

After the replacement of the motherboard, grub is not visible on startup. Before replacement, grub boot loader used to show up on startup with Kali Linux, Windows 11 options available. I can manually ...
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Fedora 34 update was interupted and I cannot boot anymore, initamfs is not found

I got a power cut during an update of my fedora 34 and now it does not boot anymore. On the latest kernel I get the following message error: ../../grub-core/fs/fshelp.c:257:file /initamfs-5.16.11-100....
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grub2 boot linux from another lvm volume

I have a debian 10 running on a raid1/LVM with being /root /usr /home different logic volumes (LV's) in the same volume group (vg00). This install can boot two kernels using grub2. That works great so ...
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Grub-customizer trying to use `KDE su` - Cannot login

I would like to use Grub Customizer, but I cannot start it. After entering the administrator password, it asks again for it: (see update below: I guess the first image shows an interface that is not ...
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4 votes
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How to set default kernel in Debian?

I am having a 5.10.0-11-cloud-amd64 kernel and have installed 5.10.0-12-amd64 kernel on Debian 11.2. I want to set 5.10.0-12-amd64 as the default kernel temporarily.I am new to Grub, How to set the ...
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How to reboot into CLI?

I need to perform some housekeeping on /home, so I figure I should reboot into CLI instead of into GUI. How do I do that on KDE Neon? For additional info, I'm using an UEFI system, GPT, and grub2.
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GRUB password on KVM virtual machine

I'm trying to put my virtual machines in compliance with the SCAP Security Guides. There's a rule that requires GRUB to be password protected. After setting user and password for GRUB, my virtual ...
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Grub entry not booting up

My grub installation broke recently. I attempted to fix it by running the following commands from my Ubuntu distribution and Arch Linux distribution: sudo os-prober sudo grub-mkconfig /boot/grub/grub....
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Multi-Drive Grub Setup

My depth of knowledge for the linux boot process has always been the minimal necessary to get my system working, and my systems so far have always been pretty vanilla. So this may be an obvious set of ...
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How does Grub check if a system started successfully?

I am testing an automated migration from Windows to Linux using Grub2 on my EFI partition. My goal is to have a fallback solution in place so when booting from my new Linux image fails, the existing ...
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Reinstall GRUB (grub-install: warning: EFI variables are not supported on this system.)

For some reason GRUB on hard drive WDC WD40EJRX-89A disappear. Maybe the reason is that I physically change SATA drives/cables and I'm not sure if I plug SATA cables in same slots. I try to reinstall ...
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Compiling linux kernel: update-initramfs does not find new kernel

I try to compile a linux Kernel from sources, using the standard procedure make defconfig make menuconfig make -j9 make modules -j9 sudo make modules_install sudo make install My kernel is built ...
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Change default boot from Windows to Linux

I have a system that shipped with Windows 10. I installed Rocky 8.5 on it. When the system boots it defaults to Windows 10. I can boot to Rocky if I press F7 on boot. How would I go about changing it ...
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Grub - Assign IP to given MAC Address

I have a simple grub.cfg: net_add_addr efinet1 efinet1 10.1.1.10 net_add_route default 10.2.1.100/32 'gw' 10.1.1.254 configfile (http,10.2.1.100:8080)/grub As you can see the net_add_addr is ...
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Installing Windows 10 on a virtio VPS

I have been trying to install Windows 10 on a VPS. This VPS provider does not support loading from iso's. Only netboot.xyz, So I hosted a unpackaged a Windows ISO and booted it via netboot.xyz. I ...
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Can't escape grub after Fedora 33 update

Got Fedora & Win10 dual boot for 2 years now. I've recently updated Fedora and since then I can't boot either of the systems and can't really escape grub. Tried countless youtube/forum ideas, none ...
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How to fix "error: symbol `grub_disk_get_size' not found."?

My computer was running a dual-boot with Arch and Manjaro on their own partitions. I decided I wanted to exchange Manjaro for Debian and so I flashed the USB and deleted the Manjaro partition. ...
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Load Memdisk with linux16 / initrd16 from Grub2 UEFI

I need to load the Memdisk kernel from Grub2 in UEFI mode. I don't know if this is possible, but I am getting an unexpected unidentified error. I would like to know if it is possible and if so how to ...
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What is the BOOT.conf file used for?

I am trying to create an custom install iso for rhel 8. On the installation iso, there are 2 files in the EFI/BOOT/ directory: BOOT.conf & grub.cfg. The diff command doesn't show any difference ...
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How do I confirm a kernel flag is running from within my Linux Desktop?

If I set a flag on the Linux kernel during boot, is there a way to confirm that flag is running? For example if I set the flag iommu=on, can I check from within Linux if it is? I ask because I was ...
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3 votes
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How to modify -iter-time on a existing luks partition

first of all I already read this topic : How to change the hash-spec and iter-time of an existing dm-crypt LUKS device? where the proposal is the following command : cryptsetup-reencrypt --keep-key ...
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GRUB set default entry to the second os

I have dual boot Ubuntu and Arch, and I think there must be a way to set the default boot entry for GRUB to boot second OS, e.g., when I reboot from Arch it will boot to Ubuntu, and vice versa. Maybe ...
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