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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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 # ...
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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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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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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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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 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 ...
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8 votes
6 answers
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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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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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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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1 answer
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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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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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2 votes
1 answer
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Does GRUB2 support TPM with UEFI?

We currently have UEFI booting up GRUB which boots up Linux. We need to implement secureboot. We're using a TPM to store our keys. Does GRUB2 support TPM - I read the only version of GRUB that ...
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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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1 vote
2 answers
57 views

Cannot install Debian when CSM is disabled

I am trying to install Debian 11.2.0 (debian-11.2.0-amd64-netinst.iso) on an old Lenovo ThinkCentre M92p (Intel Core i5-3470). I upgraded BIOS to latest version (9SKT9CA, released on December 24th ...
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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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The process going on in BIOS and UEFI when they want to choose bootloader in dual boot systems

I learned something about bootloader, UEFI and BIOS but now i have question about them. at first I want to know how BIOS can decide which bootloader should load in dual boot systems In UEFI i know we ...
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2 votes
1 answer
175 views

Disabling writing dump files to efivars

Recently I noticed an issue where both of my machines (ThinkPad X230 and W530) independently started running out of NVRAM which stores UEFI boot variables. This prevents them from booting. Fortunately,...
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LUKS instruction set when booting GRUB in EFI mixed mode

There are some amd64 computers that only support to boot from UEFI in x86 (32-bit) mode but allow to load an amd64 operating system. On GNU/Linux that is usually achieved by issuing --target=i386-efi ...
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New boot manager entry added to BIOS every time I start up my PC

Every time I boot up my PC a new boot entry is added to my boot manager inside my BIOS. All the entries are exactly the same have the following name : UEFI: SAMSUNG MZHPU512HCGL-00000, Partition 7 I ...
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Changed to linux-lts and removed linux, now I cannot boot

I followed these instructions to install the lts kernel, but the last command grub-mkconfig -o /boot/grub/grub.cfg did not go through and now I cannot boot into Arch. I have a usb stick with Arch on ...
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UEFI SHIM (Compile from Source) with Built-In Certificate

I am looking for a working example of UEFI SHIM compiled from source code from https://github.com/rhboot/shim The SHIM should be using Built-In Certificate and not the MOK (Machine Owner Key) approach ...
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UEFI SHIM Error "verify_buffer() No signatures found"

Continuing from UEFI Self-Signed Kernel loading from a Microsoft Signed OS Loader I used https://github.com/rhboot/shim/releases/tag/15.4 and built on my local machine (Ubuntu 18.04 LTS) openssl req -...
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Rename entries in EFI

I have two disks with EFI boot enabled. Each of disks have its own Debian installed but with different version. When booting up it is hard to choose one - both have same label. In efibootmgr it looks ...
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There is no option for Arch Linux install medium in VirtualBox

I'm trying to install Arch Linux via VirtualBox on my Win10 machine, I enabled EFI in System tab in settings, and checked my motherboard runs on UEFI from Windows System Information. But when I start ...
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EFI partition in Linux mint MATE on non UEFI BIOS

So I just installed Linux mint MATE(install along side windows(7)) on my old laptop. Its an MBR without UEFI BIOS. When I headed over to the disks program after the installation I was shocked to see a ...
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UEFI Self-Signed Kernel loading from a Microsoft Signed OS Loader

I am writing my own OS loader (Boot Loader) in UEFI. The OS Loader is Microsoft Signed so it can run under secure-boot. The OS Loader will be able to load Windows or Linux Kernel based on User's ...
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Encrypting RHEL8's /boot & /boot/efi on a UEFI machine

My objective is to encrypt my /boot and /boot/efi partitions with luks1 on a RHEL8 UEFI secure boot system for full system encryption. I am able to encrypt (LUKS1) my /boot partition in a BIOS mode ...
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2 votes
2 answers
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Boot to GRUB in new Ubuntu Install

I have a new single boot PC. I did a fresh install of Ubuntu 20.04.3 LTS from a USB (this is not a dual boot machine). I encountered issues and so have reinstalled several times and still cannot get ...
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BIOS UEFI mode settings

I want reinstall Debian11 from LiveUSB, in UEFI mode: should I disable in BIOS these two options: "Secure Boot: disabled" and "Load Legacy Option Rom: disabled", apart from set ...
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dracut warning: /dev/mapper/foobar does not exists

I'm trying to install Void Linux with LUKS encryption on the root partition, currently, my /etc/fstab file looks like this: /dev/sda1 /boot/efi vfat rw,relatime 0 2 /dev/sda2 swap swap rw,noatime,...
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grub-install error Failed to register the EFI boot entry: Interrupted system call

I am installing Linux Mint Mate 20.2 as dual-boot with Windows 10. It all goes fine until it gets to grub-install. There it throws a Fatal Error, with the command line in the installer saying: Failed ...
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Merging two /boot/efi partitions

I recently installed Windows 10 on a 512GB SSD which was split into 2x256GB partitions. After installing Windows, I installed elementaryOS (Ubuntu 20.04). While installing, I was prompted to create a /...
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Debian unbootable after second install

I have debian on /dev/sda, I added a new drive /dev/sdc and installed a separate debian on it, now when it boots the new grub loads and it doesn't have my old debian in it. When I go into the bios and ...
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1 vote
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1k views

How to fix issue "EFI variables are not supported on this system"?

How to fix issue "EFI variables are not supported on this system."? sudo efibootmgr -v EFI variables are not supported on this system. Debian11 installed in UEFI mode, but something wrong ...
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How to re-enable UEFI mode on Debian fresh install

I replaced hard disk on laptop (2014 model) and made fresh install debian-11 in UEFI mode. Originally laptop come with Ubuntu factory-installed and Legacy BIOS (single OS). So I tried to make a clean ...
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