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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Signing grub for secureboot uefi: Secureboot forbids to load module (memdisk)/boot/grub/x86_64-efi/normal.mod

While trying to setup secureboot in custom Debian based system, grub is not loading if SB is on. I'm using shim (signed by MS) as first stage bootloader. Now I plan to use MOK to sign grub2 and ...
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19 views

Mirroring EFI System Partition (ESP) on Ubuntu

When setting up a RAID-1 Ubuntu system (i.e. where / and /boot are on RAID-1 mirrors) it's unclear to me what Ubuntu's answer is to making the EFI System Partition (ESP, i.e. /boot/efi) redundant, as ...
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60 views

Why do Unix/Linux systems still need to depend on Microsoft?

On an Ubuntu 20.04 system on Intel hardware: # cd /boot/efi/EFI/ # file $(find . -name '*.efi') ./ubuntu/grubx64.efi: PE32+ executable …, for MS Windows ./ubuntu/shimx64.efi: PE32+ executable …, for ...
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Deepin 20 ISO has issue - bootable not working

I have Asus ROG Strix G15 G512LI Gaming Laptop and I want to install Deepin 20 in it. Now when I make USB bootable and after I boot from USB it just shows me a black screen with fixed underscore on ...
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29 views

Do you need to set bootable Flag when Installing Linux in UEFI Mode?

When installing Linux, there is an option to set a partition as bootable flag. Do you need to have this option turned on if you are installing Linux in UEFI mode? and if so, what partition should it ...
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How to make non UEFI (old bios ) bootable usb disk from UEFI iso

i have iso file (isolinux) can boot only from motherboard with UEFI bios system. i want boot from and install this iso file in old motherboard witout UEFI (standard bios)
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“Corrupted” grub, cannot access BIOS

not long ago I bought an ACER NITRO 5 512 SSD, that came with Endless OS (some linux distro), after some time i installed Windows and override the SSD that was with Endless O.S, and then i installed ...
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How to add a new parameter to the arch linux kernel using efibootmgr

I'm running arch linux with esxi 7.0. What I'm trying to do is to modify the parameters of the kernel that I'm using adding a new parameter or I can also try to create a new entry. I'm not using grub,...
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I've built a new kernel on arch linux,but on the boot menu I don't see the new entry

I'm a new user of arch linux ; I'm trying to build a custom kernel. on arch linux on a GPT + EFI partition / disk. This is the video tutorial that I followed : https://www.youtube.com/watch?v=VVunP3y …...
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How do I start a Windows 10 partition on a MBR partitioned disk on a system that otherwise uses GPT/UEFI GRUB?

Okay, let me explain. This is a UEFI computer. It has two disks. The primary disk is partitioned with GPT and boots via GRUB2 to an Arch Linux partition. The secondary disk is partitioned with MBR and ...
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Bios update - no bootable device

I made a bios update ↓ http://www.gigabyte.pl/products/page/mb/ga-x99-ultra_gamingrev_10#support-dl from F6 to F7c. Currently I am unable to start my computer. I have a message "reboot and select ...
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What causes a linux VM to have more “reserved memory”(BIOS-e820) then Windows VMs?

tl;dr a Win10 VM seems to have only 1MB of 2GB (0.05%) of "hardware reserved" memory, while linux VM as a rule of thumb have 1.5% to 2% reserved? How come that the on the same setup of kvm ...
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15 views

Switch primary graphics card at GRUB?

The motherboard I'm using has integrated graphics and due to a firmware bug, the UEFI shell ("BIOS Setup") screen will only show if the the onboard graphics card is used. If a PCIe card is ...
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Why are there extra bits set in my EFI variable attributes, and how can I modify the values while preserving these attributes?

I'm running Linux 5.10-rc2 on a MacBook Pro from 2015. I'm trying to modify EFI variables to better understand how they work. However, when I try to modify them with efivar, I get an Invalid ...
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How to convert my Fedora Linux system from BIOS to UEFI

I'm changing my BIOS boot Fedora system to UEFI. I was following the guide here: How to convert an Arch Linux system from BIOS to UEFI? I have /dev/sda1 as a 1GB /boot partition. This has flags "...
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When there's no grub, how to change gpu kernal parameters?

I currently use dual AMD R9 gpus. However, I recently was forced to upgrade motherboards and to the next version of my linux distro. My old motherboard was BIOS based, and my new one is UEFI based. ...
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Fedora partition gone after battery drained out

I am on a laptop with Fedora 31 running. I went to the Fedora gnome software center, update the latest firmware and left it running. After sometime when I check the laptop, its battery drained out. I ...
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EFI Partition (/boot/efi) shows 100% Usage, even it is not

since a couple of days I ran into a strange „problem“. Using df in the console, it reports my /dev/sda1 mounted in /boot/efi as nearly full root@xxxxxxxxx:~# df -h Filesystem ...
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GRUB2 failure reading sector 0x100800 from hd0

I had to hard restart my laptop and then the grub2 cli appeared. Only Ubuntu 20.04 is installed. I did ls and I get the error from title. It's actually the same issue as here but the answer didn't ...
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49 views

Error dual boot ubuntu, not show grub selection

I installed ubuntu 20.4 next to windows 10, uefi mode, but when i start the computer starts directly ubuntu, i can't select windows 10. I tried with boot-repair and i get: LegacyWindows detectado. ...
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How do you achieve stable rEFInd or grub multiboot for Windows MacOS and Linux with multiple drives?

I have a 250GB SSD (sda) with Windows 10 on NTFS. A second 1TB SSD (sdb) has MacOS 10.15.7 using apfs, and Linux Mint 20 using btrfs and two spare partitions using ext4. I have installed rEFInd and ...
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25 views

Unified Kernel Image Buildroot

Is it possible to create Unified Kernel Image using Buildroot? I want to pack rootfs.cpio.xz and Kernel Image (EFI Stub) into a single file that can be loaded from EFI Shell.
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Boot from SSD not shown in BIOS, probably corrupted drive

This issue has occurred on my new 2 weeks old laptop, Lenovo ideapad L340 gaming. My setup is dual-boot Windows 10 and Manjaro. While I was playing a game on Windows, blue screen of death appeared, ...
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38 views

Grub's default kernel priority

I recently installed Arch on one of my machines. I installed grub in UEFI mode. While setting up Arch, I had installed linux-lts. I used it for some days, and later decided to use both LTS and regular ...
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141 views

Installing a Dual boot on MSI Motherboard with GPT disk

I am attempting to install a dualboot (Ubuntu on top of Windows 10) to a PC I have just built myself. I have no problem installing Ubuntu, its just I am unable to setup my computer to boot into it ...
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29 views

Debian grub bootloader / problem superblocks /UEFI

i have an Intel Nuc-8i3beh running a Debian 10 Buster and Windows 10 in dual boot. The Windows system was installed first. The bootloader is grub in uefi mode. System: sda -> main harddrive with ...
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34 views

General Protection Fault on Reboot

I see a General Protection Fault during a reboot after running H/W failure test followed by a reboot. There are no issues with the H/W and test case, coz the same works well the previous RHEL version. ...
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25 views

RAID call traces on RHEL8

I am seeing "Call Traces" on booting from Rhel * (4.18.0-235.el8.x86_64). The call traces appears after cold boot. I don't see any other issues. It is known issue I see a thread stuck at the ...
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92 views

Remove GRUB bootloader from EFI

On Ubuntu 20.04, I want to remove the EFI bootloader installed by the default GRUB. Basically, I'm searching for the inverse of grub-install, which does not leave any dysfunctional remains (files on ...
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1answer
35 views

A Small GUI Linux System with UEFI completely running on RAMDisk

I am developing a POS System and I am planning to use Linux. My requirements are as follows UEFI Support. (Running on x86 and x86_64) No Storage Drive so completely running on RAM and persistence ...
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18 views

grub entry for system uefi device list

I seem to remember that GRUB makes possible a menu entry that launches the system boot-device menu. This behavior is convenient for users who may wish to boot from removable media, but prefer invoking ...
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22 views

Error installing Linux in external hard disk

I was trying to install ubuntu in an external disk, when i make the partitions, it says 'failed to format ext4'. I tried with an older ubuntu version, and another distro and same error. I disabled the ...
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1answer
13 views

create new partition in place of deleted partition

I am trying to create a EFI partition on the beginning of disk. I had created one using what looked to be wrong type so I deleted it. (Wrong approach, I know, but here we are) Now I want to create a ...
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Mac ubuntu EFI won't boot

So I made a bootable flash drive containing Ubuntu image using unetboot and restarted my Mac, pressed option, the options shown were Mac HD and EFI so I choose EFI but the Mac logo comes back again ...
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23 views

arch create EFI partition — invalid token EFI System Partition

I'm following instructions given here for creation of EFI partition: https://wiki.archlinux.org/index.php/Parted But my installation is not behaving according to the description (parted) print Model:...
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554 views

Pop OS: systemd-boot can't detect Windows

I've followed the classic procedure to install Windows and Linux in dual boot. First I installed Windows in UEFI mode, then I use a bootable PopOS key to resize the main Windows partition; I created a ...
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1answer
29 views

Booting Centos 7 from dvd under qemu with uefi firmware on a mac

So, I'm in the process of trying to make what google calls a shielded image, which basically you provide the keys for the uefi boot process, and sign them image. Part one is building an image that ...
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90 views

GRUB not showing up after Dual Booting Windows 10 and Manjaro. Directly boots to Manjaro

I just installed Manjaro on my Windows10 UEFI laptop. I was expecting GRUB to show up but it directly boots into Manjaro instead. When I tried sudo update-grub. It shows this: Generating grub ...
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22 views

Is it possible to share the same Windows installation on two systems, a VM(Qemu/Libvirt) and the host. One using Legacy BIOS and the other UEFI

I want to use a single Windows installation on a VM(Qemu + Libvirt) and on my host. My VM can only use Legacy BIOS boot mode, because I'm passing through my Intel iGPU, which is currently only ...
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1answer
135 views

how to list grub2 menuentry in UEFI

I want to get the grub2 menuentry list of linux (centos 8 / fedora 32) with UEFI boot,to use grub2-set-default. I can get menu list with this command in non uefi enviroment awk -F\' '$1=="...
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34 views

Boot order corrupted after installing Pop!_OS

I tried to install Pop!_OS alongside my Windows OS on my Acer Aspire 5 A515 52G. After a failed attempt and a clean wipe of my SSD, I followed the Guide on the official Pop!_OS Website. It states that ...
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13 views

Cannot get Ubuntu Live Boot with Grub2 and secure boot with own key material to work

Okay, whats the story here? I've compiled the open source UEFI implementation for virtualization with KVM, aka. OVMF. To make this project interesting I am compiling it with the secure boot feature ...
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92 views

Keyboard does not work in MokManager during key enrollment

I am trying to enroll a MOK under Ubuntu 20.04.1 for supporting some third-party kernel modules while keeping Secure Boot enabled. The system boots fine with the stock kernel and modules, but I am ...
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35 views

Messed up Ubuntu/Windows7 dualboot

I had a dualboot installation of Windows 7 and Debian that looked something like this: /dev/sda1 - EFI boot partition ~100MB (made during Debian installation) /dev/sda2 - unknown, likely Windows ...
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277 views

EFI boot error: Please append a correct device “root=” boot option

I try to start the system (Kubuntu 20.04) without a Bootloader direct from the EFI/BIOS for faster boot. I compiled the Linux-kernel-5.8.5, copied and renamed the /usr/src/linux-5.8.5/arch/x86/boot/...
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142 views

System bootloader not found

I recently installed UbuntuDDE 20.04 LTS to be able to dual boot with Windows 10. After following the instructions online, I was able to get it up and running. However, after shutting down my PC and ...
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44 views

Ubuntu 18.04 won't boot after booting from 20.04 live USB

This is a bit of a strange problem. I've been running Ubuntu MATE 18.04 on my Acer Aspire desktop for a few years now. I was thinking about wiping it out and installing Xubuntu 20.04, so I booted it ...
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20 views

previous successful Kubuntu 20.04 LTSB EFI dual boot now boot looping?

One day my touchpad stopped taking input so I rebooted my laptop & haven't since been able to return to Kubuntu. When choosing it in GRUB I see (1) the OEM logo for ~1 sec, (2) the Kubuntu splash ...
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20 views

How to make a bootable windows 7 uefi for gpt disks?

Arrrghh....by far tried so many ways to make a uefi bootable windows 7 for my GUID parted hhd in linux . I tried so many linux tools but faild to do so I tried gparted,unetbootin,woeusb and still I ...
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40 views

Build shim requires missing file efi.mk

I'm trying to build shim on debian (buster), sources from git. It's missing the file called efi.mk which is necessary from include/defaults.mk, line 81. The package gnu-efi 3.0.9-1 does not contain ...

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