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Questions tagged [efi]

EFI stands for Extensible Firmware Interface, and is an updated version of BIOS. It sits between firmware and the operating system in the software stack.

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How to Recreate EFI Partition?

System: Macbook Pro 2019 with Intel & T2, upgraded to Sonoma. Objective: Dual boot with Fedora. Trouble: I accidentally deleted the EFI System Partition on MacOS. Now, I do have EFI for T2Linux (...
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How to delete additional EFI (EFI NO NAME), for installing Fedora using T2Linux?

I am trying to dual boot Macbook Pro 2019 with Intel & T2 using https://t2linux.org by installing Linux/ Fedora. Now, the system is NOT booting to live ISO USB. **me@mes-MacBook-Pro ~ % diskutil ...
tom_kp's user avatar
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My Dell OptiPlex 990 boot is very slow and I don’t know why

I have a Dell OptiPlex 990 with good specs like an SSD, i5 2500, and 8GB RAM. The system is extremely slow when booting from a Ventoy USB flash drive to install Windows or Linux, hanging for a few ...
Andrei Chiper's user avatar
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2 answers
200 views

Default Windows 11 partitions / partitioning scheme

Sometimes you need to partition your disk which already contains a different operating system (OS) or version of Windows thus you use Linux tools such as fdisk or gdisk to create/configure partitions ...
Artem S. Tashkinov's user avatar
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2 answers
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Hp 14-dk0xxx BIOS update, but just how?

I have this 14-dk0xxx notebook where I have installed Ubuntu 22 LTS. I just wanted to update the bios but it seems a mess. Ok I have no Windows like the other 90% of the users do, so I dowloaded the ....
user3450548's user avatar
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Installing Archlinx (Archcraft) alongside Windows 11 w/ EFI, but partition shows MBR?

Installing Archlinux (Archcraft) alongside a pre-installed Windows 11.. I was expecting the Windows EFI system partition to show GPT, but viewing it within a live USB of Archcraft via fdisk -l reveals ...
yudhishthira's user avatar
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1 answer
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How to regenerate Windows boot files without being able to boot into it

So I have an EFI dual boot system with Windows and Arch, and because of some grub tomfoolery I ended up completely wiping the EFI partition and installing systemd-boot. But now I don't have any way to ...
pixup1's user avatar
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Windows 11 UEFI - Issues Moving SSD BootManager

Is anyone able to help fix boot manager issues when trying to (native) boot to vhdx once copied to a new partition on a new ssd? I'm creating a new thread as my reputation prohibits me from commenting ...
Jonny's user avatar
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bootmgfw.efi not able to load further after being downloaded by network during PXE, but loads fine if loaded from disk

I am trying to load into winpe using bootmgfw.efi, it is being downlaoded by TFTP download looks fine, but after downloading, it is stuck at a blank screen and TFTP log says downloaded is the last ...
Sagar C A's user avatar
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Windows 11 not detected by GRUB

Recently I installed Debian 12 and can't boot into Windows 11 anymore. I noticed there is no EFI system partition (ESP) present on my Windows disk. EDIT: CREATING NEW EFI SYSTEM PARTITION FOR WINDOWS ...
Sobek's user avatar
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Update AMI American Megatrends BIOS via EFI/UEFI firmware shell

I have found an used gigabyte brixx nuc style pc and wanted to try to update it's bios for testing, because some other versions has been released. The device hasn't a direct flash utility inside so I ...
user3450548's user avatar
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EFI/Bios/Grub: Notebook Doesn‘t boot neither HDD nor Fedora install media

I had a parallel installation of W10 and Fedora Linux. Was fine although prompting error of unknown TPM error the last time but the Notebook booted. Then I Installed Fedora 39 immutable Onyx. Deleted ...
psamu's user avatar
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HDD EFI\MICROSOFT\BOOT both EFI\MICROSOFT\RECOVERY empty

Hi i accidently formated some parts of partisions on my laptop. Now when it stats it's just a blank blue screen , not that basic with that sad face , but really empty blue screen. I dont know how to ...
Nicolas Michlik's user avatar
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1 answer
600 views

Windows is not showing up in boot menu after installing Pop_OS on a separate NVMe drive

I have two NVMes on my laptop. I already have Windows 11 in one, and I wanted to install Pop_OS on the other. After installing Pop_OS, it only showed Pop_OS in the boot menu after starting up the ...
ray_lv's user avatar
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1 answer
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Is there any way to restore / rebuild EFI without using a Windows bootable DVD?

I've got a frustrating problem with some old hardware. Due to some awfully designed firmware which hasn't had a new release since 2016, I can't boot from a USB stick containing an unpartitioned UDF ...
Philip Couling's user avatar
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How does \EFI\MICROSOFT\BOOT\BOOTMGFW.EFI interpret the "optional data" payload passed to it by EFI?

My computer currently has two EFI bootNNNN entries for Windows: Boot0004 Windows Boot Manager HD(1,GPT,[redacted],0x800,0x1ff800)/File(\EFI\MICROSOFT\BOOT\BOOTMGFW.EFI)...
zwol's user avatar
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Mecerl laptop gives a an efi screen

when I turn on my latop, a screen apear, with the following message Efi shell version 2.40 (5.11) map: cannot find required map name please help
Mariesa 's user avatar
1 vote
1 answer
412 views

How do I transfer boot partitions after installing Windows 10 and 11 to different drives?

I have a computer that dual boots Windows 10 and 11. Windows 10 was installed first on a SATA SSD, while Windows 11 was installed afterwards to a separate M.2 SSD. Now that I've been on Windows 11 for ...
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How to fix accidentally deleting EFI partitions on dualboot windows 7 and linux

TL; DR: How to fix EFI partitions that accidently deleted and cause windows 7 gone from dual boot What happend: So recently im dualbooting windows 7 with linux zorin os (based on ubuntu) and tried to ...
Ricky Nolep's user avatar
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2k views

How to use efi partition for windows and multiple linux multi boot setup

I recently bought a laptop and wanted to install multiple Linux flavors alongside the provided Windows 11. In a video tutorial, they suggest creating a separate EFI partition and selecting it as the ...
Susitha Ravinda Senarath's user avatar
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Why same menu entry does not work when grub is installed with `--uefi-secure-boot` option?

My laptop with Secure boot disabled and enabled CSM support. I installed grub onto my USB stick with --no-uefi-secure-boot options: sudo grub-install --target=x86_64-efi --no-uefi-secure-boot --...
Eugen Konkov's user avatar
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1 answer
139 views

How to enter BIOS menu?

Laptop Fujitsu LH532. After an unsuccessful attempt to install Arch Linux, I cannot enter the BIOS menu of the laptop. It just beeps, power keeps being on, but it doesn't load anything and does not ...
Cat-with-a-pipe's user avatar
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1 answer
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Unable to boot system after removing disk 2 even if windows is installed on disk 1

I have two hard disk, DISK 0 is SSD where windows is installed and DISK 1 is Mechanical HDD. I want to replace DISK 1 with another SSD, but when I remove Disk 1, I'm unable to boot the system (Message ...
Sumit P Makwana's user avatar
1 vote
0 answers
175 views

Can't automatically load my efi driver on each system boot

I am trying to make my UEFI driver start on each boot by setting up NVRAM variables via my own program. I've made a program that puts my uefi driver into the EFI partition on the disk and set system ...
NoName's user avatar
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1 answer
2k views

/sys/firmware/efi/efivars mount point does not exist on artix (QEMU on arch) EFI variables are not supported on this system

I'm trying to install Artix Linux on a virtual machine before I install it on actual hardware. I'm using QEMU. When trying to install GRUB via grub-install --target=x86_64-efi --efi-directory=/boot/...
redpz's user avatar
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1 answer
1k views

Windows 11 not booting after fresh installation

Recently I posted a question when my Windows 11 installation failed to boot. I assumed this was due to me changing a EnableVirtualizationBasedSecurity group policy, but being unable to recover from ...
Johannes H.'s user avatar
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43 views

How to make bootable EFI USB Stick boot from harddisk with existing Windows EFI boot parition (add second boot partition) [duplicate]

I have a bootable USB stick created using PEBakery on a Fat32 partition that resides on a USB flash drive. When I insert this flash drive into a USB port of my computer and boot, it will be recognized ...
Erik's user avatar
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Cannot delete ubuntu directory from EFI partition

I followed this answer trying to delete Ubuntu from dualboot https://askubuntu.com/questions/1150814/how-to-remove-ubuntu-from-efi-partition Error states that there's no such directory, even though it ...
Kofa's user avatar
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2 votes
0 answers
283 views

Proxy DHCP via dnsmasq: Grub welcomes me, but then gets stuck

I am attempting to EFI PXE boot GRUB2 using a Proxy DHCP server... It worked just fine with this configuration, which simply replaced the DHCP server: interface=enp3s0 dhcp-range=192.168.1.10,192.168....
Tuxifan WasAuchImmer's user avatar
1 vote
0 answers
139 views

Understanding why Windows boot fails when EFI partition is moved

Situation I got a new computer with a HDD. I put SSDs in it and made RAID1, then started installing Windows Server 2022. I wanted to use SSDs and a HDD for data. I noticed the HDD already had some ...
Kitet's user avatar
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1 vote
0 answers
285 views

dd cloned Windows disk to new SSD – boot from clone with error "windows/system32/winload.efi" missing

I cloned my old external SSD /dev/disk2 to my new external SSD /dev/disk5 on macOS with dd. When I now try to boot new SSD /dev/disk5 the error "windows/system32/winload.efi missing" occurs ...
Kevin Lieser's user avatar
0 votes
1 answer
863 views

EFI Partition not taking up full space

I originally installed Windows onto my computer, so it had the default 100MB EFI Partition. Recently, I wanted to dual boot Arch and Windows 11, so I resized the partition from 100MB to 598MB (an ...
eten's user avatar
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0 votes
1 answer
854 views

Create a backup of the EFI partition on a USB

I have Ubuntu on M.2 disk y Windows 10 on un SSD I had install windows with ubuntu already installed, Windows has put its bootloader in the EFI partition of Ubuntu, since the M.2 disk is the first ...
Mario's user avatar
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1 vote
0 answers
65 views

How is display initiated after sleep mode? Does the BIOS/OS uses the EFI partition?

I'm having some weird lines displayed in my screen after my computer goes to sleep mode and when I turn it on. These lines are displayed randomly and I think it has something to do with the EFI ...
Álvaro Rodríguez's user avatar
1 vote
1 answer
2k views

How do I remove a phantom Windows Boot Manager displayed by grub?

I have a dual-boot dual-drive Dell Optiplex 7060, with a SATA SSD and an NVME stick. Ubuntu Linux 22.04 is installed on /dev/nvme0. Windows 11 is installed on /dev/sda. I first installed Ubuntu on the ...
Dan Halbert's user avatar
-2 votes
1 answer
333 views

Default Windows 10 64 EFI partitions / partitioning scheme

Sometimes you need to partition your disk which already contains a different operating system (OS) or version of Windows thus you use Linux tools such as fdisk or gdisk to create/configure partitions ...
Artem S. Tashkinov's user avatar
0 votes
1 answer
5k views

How remedy situation with two EFI partitions on one drive?

I've got a laptop with two EFI partitions, one for Windows, one for PopOS (I know now this isn't a stable configuration). It was working great for a while - I was able to switch between the two (in ...
UpTheCreek's user avatar
0 votes
0 answers
2k views

Cant get to BIOS menu pages (Insydeh20 setup utility)

I have been trying to boot a USB pen with the gparted live, but it seems it is not detected. Most solutions that I found require me to access the BIOS setup where I should change the boot priorities ...
António Abranches Pinto's user avatar
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0 answers
1k views

Run .efi file on virtual machine

I'm learning baremetal and creating .efi file I can run at boot, like this pong game But rebooting after compilation, then selecting the right drive to boot, just to test the file, is a bit tedious. ...
sayanel's user avatar
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1 vote
1 answer
91 views

Is it possible to precreate partitions for Windows 10 install on a dual SSD laptop?

I have a laptop with 2 SSD. I want to install on 1 drive, so all of the partitions: EFI, Recovery, System Reserved, main C drive to be all on this drive. For some reasons in my case, the default ...
mle0312's user avatar
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1 vote
0 answers
1k views

New install of Pop!_OS, dual booting on a Dell machine with Pre-installed Windows 10. 522mb EFI boot partition is 97% full. Why?

Every time I boot up I get the warning Low disk space on 'efi' The volume 'efi' has only 12.4 MB disk space remaining. Overview: This is a brand new machine, a Dell XPS 17 that came preinstalled ...
Inigo's user avatar
  • 111
1 vote
1 answer
5k views

How to install GRUB EFI to RAID1

While configuring a new server, I try to install the Debian Linux Buster at mirrored disks /dev/sda and /dev/sdb with uEFI. I tried various combination: var1: /dev/sda and /dev/sdb - > /dev/md1 (...
schweik's user avatar
  • 155
1 vote
1 answer
116 views

Moving a (suspected) grub partition safety when resizing partitions

I am trying to allocate more space to a windows partition by shrinking a linux partition on the same drive, but there is an EFI partition in between the linux and window partitions. This is a picture ...
randomzebra's user avatar
1 vote
1 answer
2k views

GRUB shows menu for Ubuntu 20.04 but not for Pop!_OS 22.04

I decided to switch to Pop!_OS 22.04 from Ubuntu 20.04, while I'm mentally preparing to switch to Devuan in the future. The GRUB is configurable from Ubuntu as expected, but when I do exactly the same ...
Andrew15_5's user avatar
0 votes
0 answers
33 views

Any Windows bootable media won't boot after fixing GRUB2

Recently, I accidentally deleted EFI and Windows partition. Then, I tried fixing the GRUB first on a Ubuntu bootable media (it booted fine). After that, I made Windows bootable using Rufus. But, the ...
Fabieen Rae's user avatar
2 votes
1 answer
856 views

What should be the content of the first sector in a UEFI system with GPT partitions?

As i understand, in UEFI machines there is no MBR/VBR code, and the UEFI firmware directly gives control to the OS boot loader (.efi file). My question is, what should be first sector of such system ...
OneAndOnly's user avatar
1 vote
0 answers
339 views

How to move EFI folder to C drive

I want to remove an SSD from my main rig to use it in a retro machine. However I've must have placed a EFI folder there by accident when I reinstalled windows 10 on a larger NVME drive. 120GB drive ...
Jonasz Przybycień's user avatar
3 votes
3 answers
2k views

How to normalise Win10 MBR partition to migrate to GPT and standard EFI

My aim is to be able to upgrade to Windows 11. It was originally a Windows XP installation, that went through all the upgrades to WinVista, Win7, Win8, Win8.1 and Win10. With my upgrade path I never ...
rarog4k's user avatar
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0 votes
1 answer
2k views

Moving the Recovery Partition, EFI System Partition, and a 16mb "Reserved Partition" to resize Windows partition

This is my first question, so please let me know if I'm missing something. Long story short, I messed up one of my Windows 10 installation on another SSD and ended up with a Windows system drive too ...
Elizabeth V.'s user avatar
0 votes
0 answers
148 views

Ubuntu 18 partition error

I'm new on Linux, just created VROC NVMe RAID1 and installed Ubuntu 18.04.3 on it. Then noticed that lsblk gives an error: "GPT PMBR size mismatch (1781612543 != 1875385007) will be corrected by ...
Perfect Stranger's user avatar

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