Questions tagged [uefi]

Questions about the Unified Extensible Firmware Interface (UEFI), the software interface aiming to replace typical BIOSes. This tag may also be used for questions related to UEFI partitions and systems.

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Unable to boot Linux kernel directly through EFISTUB

I've compiled Linux kernel 5.18.4 from source, enabling all the EFI-related options, without any built-in parameters, nor a default init path, also, it's worth mentioning that i'm not making use of ...
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BOOTx64.EFI file boots but only directly, not when UEFI is directed to the external SSD

I have an external SSD with Arch Linux on it. The ESP is mounted to /boot. On the ESP, I have the directory EFI and in that, there is a BOOT directory. I created a BOOTx64.EFI using an /ext/kernel/...
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Updated GRUB on Arch linux, tried fix but GRUB gives error: Symbol grub_debug_malloc not found

I posted this same post on r/archlinux but have not gotten much results. I updated Arch Linux (vanilla), but now GRUB boots into firmware. (I am sure a lot of you guys have known this issue, and I did ...
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is it recommended to run two separate ESP drive with separate OS installed

I have a windows EFI system partition and I would like to dual boot a Linux drive with it cause my system supports secondary drive.I did some research and it seems it's not recommended to run two ESP ...
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Booting from 'USB: USB SanDisk ... ' failed; verify it contains a 64-bit UEFI OS

I installed Debian on a USB drive using the regular install. When I tried booting from it it says on a black screen and won't let me go further: Booting from 'USB: USB SanDisk ... ' failed; verify it ...
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UEFI pre-boot environment exception when booting with custom-built Linux kernel

I'm trying to build Linux kernel from scratch. My current system with an Intel Xeon Gold 6242 CPU, running Linux 5.4.0-050400-generic kernel on Ubuntu 20.04.3 LTS. The steps I have followed to build ...
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GRUB command line. Have to boot manually

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,...
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I installed fedora silverblue on my 2014 iMac, I can't see usb drives on the boot loader and cant access uefi settings

Trying to access UEFI gives me the error /grub-core/commands/efi/efifwsetup.c:61:Reboot to firmware setup is not supported
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How to start differently inside VM or raw firmware

tltr: How can we have different default entry/settings in uefi/bootloader based on hardware ? I want two boot configurations with differents settings based on hardware. Typical usage is inside VM ...
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Recovering non booting system, probably due to power failure

I cycled the power on my Void Linux install when Firefox froze and would not respond to sigterm (poweroff command was hanging too). After doing this the computer (Thinkpad X220) no longer boots, it ...
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Add Windows to GRUB

I have fedora. I got my efi windows partition mounted on "/boot/windows_efi" Here is the screenshot. Bios now recognizes this partition, and allows me to boot into windows, but not the grub. ...
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Who creates EFI partition on a UEFI system?

Who creates EFI partition on a UEFI system and keep the grub exe there? Is that the OS Distro has this directory and later mounted while a first time installation on the UEFI machine?
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How to get back my windows and windows loader?

I installed a Linux (Fedora) as second OS. I did like that so many times but with other distros. After installing I tried to boot in my first OS (Windows 11), but in a grub I didn't see her. I tried ...
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3 answers
160 views

UEFI boot never runs from /dev/sda but works from rescue DVD

I have Hyper-V on my Windows 10 laptop, with a generation 1 VM running RHEL 7.9. I am attempting to update it to run on a generation 2 VM, using UEFI boot. As part of the move to a gen-2 VM, I need ...
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How to run custom kernel and initrd in UEFI?

I have a dev machine with BIOS and after compiling my kernel and initrd, I'm able to use it with a simple menuentry: menuentry "mlinux" { linux /boot/mlinuz quiet initrd /boot/...
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HP Elitebook - Cant selec't linux mint as firts bootable OS

I have a second hand HP Elitebook Folio1040 that had windows10 installed. I deleted windows and installed Linux Mint Una (20.3), rebooted the PC but I can't manage to boot Linux automatically. After ...
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How to delete all partitions without using an operating system

How to delete all partitions from my system using only the GNU Grub Terminal and BIOS
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1 answer
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Editing grub menu with secure boot enabled Ubuntu/PartedMagic

I have laptop DELL latitude 5491 with preinstalled Windows 10 with secure boot enabled and EFI mode. After I purchased, I installed Ubuntu 20.04 next to Windows as a dualboot with still secure boot ...
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Linux Peppermint isn't booting in Dual boot

I have Windows installed in UEFI and later Linux Peppermint installed in legacy then both were booting with windows in UEFI and Linux in legacy. Later I have installed Windows in UEFI and Linux ...
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Dual boot - cannot get to second grub menu (are my expectations wrong?)

I have two different distros installed. Os1 was installed by a gui installer first, with an efi partition and a system partition. Os2 is vanilla artix so I have set that up second using basestrap from ...
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Why would Linux boot from a USB drive but not a hard drive?

I have a x86_64 Linux Kernel, with EFI_STUB enabled, and packaged into a EFI System Partition that I compiled using Buildroot. It generally will boot on any machine by just dd'ing it to a device and ...
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Cant Escape Emergency Mode to Default Mode Pop!_OS After "Windows Volume Repair" and fsck

I am dual booting Pop_OS! 22.04. I booted into Windows, finished what I was doing there then went back to boot into Pop!_OS and discovered it would not boot, it was giving me some sort of diagnostic ...
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Why do I get "no bootable device" after installing BlackArch alongside windows 11?

I have created a usb iso bootable drive with Blackarch on it, ran through the installation procedures and once finished rebooted my system without the drive and get an error saying "no bootable ...
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1 answer
199 views

Two SSD, Two Linux Distro - Which grub is showing the grub menu during boot?

I have two seperate Linux distro in two SSD. Zorin (/dev/sda) Linux Mint (/dev/sde) First I installed Zorin then Linux Mint. I ran bootinfoscript. Here is the gist of the result. Boot ...
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Create bootable syslinux USB on UEFI

We use a Centos 8 machine to create syslinux bootable USB installers for our product. The created USB now supports only target machines with BIOS (or with CSM mode turned on) but we need to update it ...
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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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How to remove 2 or more linux distros on a windows dual boot to install ubuntu again

So I have two linux distros along with windows 11. Windows 10 was present first and then ELEMENTARY OS and KALI LINUX were installed. About a year later, since my pc was low on RAM and not doing good ...
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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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Cannot boot live into linux from USB on Asus ROG laptop

I'm trying to dual boot on my Asus ROG Flow x13 laptop. I want to dual boot Fedora Workstation, but I'm having an issue where whenever I select Start Fedora-Workstation-Live 35 the screen will just go ...
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How to fix EFI when bootrepair won't work

Environment: Parrot OS 5/Windows 10, Grub 2 Hello, I messed up my EFI somehow when trying to figure out how to put Qubes on an external SSD. When I see the ParrotOS boot screen it gives me the option ...
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Is my server using Legacy BIOS or UEFI?

I am little confused about something. I have a server on Digital Ocean, I want to know either BIOS or UEFI used for system startup. I have tried following things: root@debian:~$ dmidecode -t 0 # ...
1 vote
1 answer
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Can you use MBR with UEFI - a question about the UEFI specification

I am reading through the UEFI standard: https://uefi.org/sites/default/files/resources/UEFI_Spec_2_9_2021_03_18.pdf On page 115 section 5 it discusses the GPT disk layout. I'm a bit confused as to ...
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286 views

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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111 views

move /boot to separate partition

I have Fedora 35 installation, where I placed /boot/efi in separate (physical) partition, / in separate (also physical) partition and I have separate lvm partition where I keep my /home volume. I ...
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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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1 answer
191 views

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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118 views

How do you edit the UEFI entries of a USB drive from a legacy booted system?

I've been trying to figure out how to edit the EFI entries of a USB drive I have using efibootmgr but it only gives me EFI variables are not supported on this system. even when I point it at the USB ...
8 votes
6 answers
3k views

Unmount /boot after booting

For some highly secure bastion VMs I'll implement soon, I am considering to unmount /boot after booting - among other measures of course. Will be mounted only for updating kernel. Testing this, no ...
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external boot efi shell when secure boot is turned on

I don't have a built in uefi shell in my laptop and I have secure boot turned on. I would be happy for a signed uefi shell that I can boot into (edk2, tianocore shell.efi files are not signed and I ...
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Efi Partition System format box leave it blank or checkmark it(Linux only installation)

Feeling very confused about this one .In a Linux only installation in UEFI mode,for Efi partition,do I need to tick(checkmark) the format box or just leave it blank. I had seen You tube videos & ...
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Error: NVram is locked

I have a problem like this: https://paste2.org/7HMJZKsh I use ZorinOS 16 and MBR with a table partition like this: MY Notebook Asus A45A Core i3 2370M RAM 6 GB Intel HD Graphic 3000 HDD 500GB What ...
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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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I can't boot to window after changing the boot entry of the EFI bootloader

Every problem started just after I typed the bcdedit code..😹 I just want to undo my command. Actually I had an issue with dual-booting, but it doesn't matter anymore. I JUST WANT TO GO BACK TO WINDOW ...
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How to create a USB Kali UEFI bootable dongle with a exFAT partition

I'm struggling with the creation of a USB UEFI bootable dongle of kali linux. Basically I want to create a dongle able to boot kali linux in UEFI mode that also has an exFAT partition recognizable by ...
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419 views

Arch (or Manjaro) install into KVM VM: UEFI boot disk not found after cold start

I installed Arch Linux into a KVM virtual machine using the Installation Guide. The installation was successful because after rebooting, I boot into my fresh installation. The problem is that after I ...
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1 answer
327 views

Strange NVMe “BootDevice Not Found” error on HP EliteDesk 800 G2 Mini

I installed Debian 11 on Samsung SSD 970 EVO Plus 1TB… everything worked as expected. I disconnected (removed) NVMe from computer and booted to Tails using USB flash drive… everything worked as ...
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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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778 views

QEMU KVM Black Screen

I have KVM enabled on my phone and it works, but it stays on a black screen except for QEMU Monitor stdio (But it only shows text like Press a key to boot from CD/DVD. In GUI sections, a line flashes)...
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Does formatting efi partition on a Chromebook (with custom firmware) affects ChromeOS?

Recently I got a Chromebook (board: SASUKE), I've been able to install a custom firmware following these instructions. Now I have a messy partition table (I used chrx) and I installed a working Arch ...
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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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