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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3k views

When installing Fedora 26 I somehow installed in Legacy mode(?) and now I can't boot into Windows

I downloaded the Fedora 26 Media Creation tool, made my USB bootable, and then installed Fedora 26 onto a partition I had made on my boot drive. I booted into Fedora, selected the free partition and ...
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1answer
413 views

Can't boot into Windows after updating boot partition table

I've been seeing some error messages regarding the formatting and/or partitioning of my hard drive (ie. file descriptor errors, magic number mismatch errors), and while poking around in gdisk, I saw ...
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2answers
2k views

How can I prevent update-grub from overwriting existing bootloader?

I use openSUSE Tumbleweed as my primary distribution, and Kali Linux as my secondary distribution in my laptop. I installed Kali Linux first; after that, I installed Tumbleweed which removed Kali ...
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2answers
19k views

Grub installation failed

I had a good running installation of Debian Jessie, but then I ran apt-get update && apt-get upgrade && apt-get dist-upgrade. And then after rebooting, it came directly to the BIOS. I ...
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1answer
2k views

How does GRUB 2 work under multiple Linux partitions with UEFI

When we install a new Linux, the installer will install a bootloader (efi file) at EFI partition and update the menu entry at NVRAM, and most likely set the newly added bootloader as default. The ...
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239 views

Can't Boot Live CD In VirtualBox UEFI/EFI Mode

I really need to boot into a live CD in EFI mode so I can run update-grub2 but it keeps using BIOS mode for some reason. I set mount points and chroot to the install I want to work on and then update ...
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2answers
3k views

Resizing the ESP /boot/efi partition

I have an existing Debian 9 installation on a 2 TB GPT formatted internal SSD/SATA hybrid hard disk on a brand new Acer laptop. The entire Debian install takes up a mere 600 GB of the hard drive. No ...
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1answer
2k views

Fixing GRUB after I replace Ubuntu with Arch on a dual boot with Windows on a Lenovo T440p

I have the Lenovo recovery CD and started with a fresh install of Windows 7. I installed Ubuntu and GRUB was able to run both operating systems. I tried to follow the Arch docs, but It's not clear ...
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1answer
597 views

How to boot UEFI image from PXE?

I would like to load Memtest86 image file from PXE. Unfortunately, their ISO file on site contains old version of Memtest, which load automatically with this config: DEFAULT menu.c32 PROMPT 0 #MENU ...
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1answer
614 views

efibootmgr: Could not delete variable: Interrupted system call— is my firmware bricked?

I'm dealing with some strange UEFI problems and right now the only thing I seem to be able to boot is openSUSE Tumbleweed on a live USB stick (KDE version, snapshot 20170608 x64). Background: I'm ...
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0answers
233 views

Arch Linux won't boot in MacBook Air in UEFI mode

I am trying to install Arch Linux (any Arch based distro) on my MacBook Air 2011 in UEFI mode but the bootable USB drive just won't boot. When I restart and press the Alt key I get an option for EFI ...
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2answers
472 views

Copying a non-EFI/GPT installation to a EFI/GPT installation

I recently purchased 2 SSDs (my first), and will be moving my system there. I'm using MD RAID 1 + LVM. I haven't yet decided whether I will be setting up a new stretch installation, or copying my ...
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1answer
2k views

EFI system partition on top of MD RAID and LVM

I'd like to put a EFI system partition on top of a MD RAID 1 + LVM setup. So the ESP would be a Logical Volume on top of the MD RAID device. I've heard mixed things about whether this is possible. Has ...
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0answers
329 views

PXEBoot UEFI not downloading configuration files

I setup dnsmasq (ver. 2.76 to support UEFI) When the client starts the DHCP requests are made. Proper file name is propagated to the client (via TFTP) but client only downloads this grubx64.efi file ...
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0answers
978 views

GRUB menu does not show up after installing linux mint 18 alongside Windows 10 during boot

I have installed linux mint 18 alongside Windows 10 with UEFI in HP 240 G1 Notebook. After installation, the grub did not show up. and it booted me directly into windows 10. But when I press esc ...
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1answer
505 views

How can I tell if the Debian installer has booted in UEFI mode or not?

The Debian Wiki UEFI page says Troubleshooting How to tell if you've booted via UEFI The Debian installer splash screen will say it's the UEFI installer, and will look slightly different to ...
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1answer
394 views

Full clone of encrypted disk not bootable on other computers

I have made a full disk clone of my encrypted S2 disk to an external USB disk with dd if=/dev/nvme0n1 of=/dev/sdb status=progress The S2 disk was not mounted when cloning, I used a live distribution ...
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3answers
1k views

Is there an open source alternative to UEFI's Secure Boot? [closed]

From what I know UEFI and its Secure Boot are deeply problematic and certainly not the way forward. See: https://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface#Criticism Also here it ...
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1answer
2k views

virtualbox uefi PXEBoot

I have successfully managed to setup PXEboot environment (based on foreman) with BIOS based systems. I could do the same with virtualbox using default BIOS subsystem. As UEFI starts to be more and ...
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1answer
323 views

How to installed Debian 8.8 uEFI

I have a machine with uEFI firmware. Windows 10 is installed using uEFI method. Debian 8.8 Jessie seems to report that it is installing with BIOS method and not uEFI, because during grub bootloader ...
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0answers
444 views

Long booting to password screen for encrypted disk

Half year ago I bought laptop HP EliteBook 850 G3 with Intel i7, 16GB RAM and 512GB SDD. This was my first time when in installator I chose option "full encrypted disk" (don't remember exactly name). ...
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1answer
5k views

Boot Linux Mint from USB in Legacy Mode

I have an Asus-X550LD with Windows 7 installed, and for the past few hours I have been unsuccessfully trying to install Linux Mint on my machine in order to create a dual boot system. I wrote the ...
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2answers
4k views

EFI system partition is it required?

I just bought a Dell XPS with Ubuntu pre-installed. I want to install another distribution instead. The system came with the following partitions: Do I need to keep the first two partitions or can I ...
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1answer
613 views

Efibootmgr does not add disk GUID in HD param

I'm trying to install qubes OS, it's nearly complete there only seems to be one issue left. Some background first: Both Windows and Ubuntu have at one point successfully booted in UEFI mode. Their ...
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0answers
415 views

How to reboot Windows 10 [UEFI] after Linux (Fedora 24) Legacy installation?

Recently I tried installing Linux in my laptop to dual boot with Windows 10, but I accidently did it in Legacy mode. I created a separate partition with 20gb for Linux and installed it in that ...
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0answers
315 views

Do I need an separate EFI partition for each OS sharing a common disk?

I was installing FreeBSD on my MacBook Air. When partitioning the disk, the installer told me This partition scheme requires a boot partition for the disk to be bootable. Would you like to make ...
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1answer
943 views

Should I use legacy BIOS for Debian or get a new mainboard? [closed]

So here I found out that my mainboard B250 PC MATE is apparently not working with non-Windows operating systems with UEFI* and now I'm wondering whether it would be better to get a new mainboard or to ...
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1answer
1k views

Installing GRUB to encrypted partition doesn't work if (root) is F2FS

I'm trying to setup a new Arch Linux installation with encrypted /boot partition, as described here: https://wiki.archlinux.org/index.php/Dm-crypt/Encrypting_an_entire_system#Encrypted_boot_partition_....
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2answers
4k views

How to install Debian with full disk encryption for UEFI?

So I'm trying to install the latest version of Debian on my SSD drive with UEFI. I'd like to use the CinnamonKDE desktop environment and have my drive fully encrypted. I used Windows 10 before and am ...
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1answer
296 views

GRUB only detects Windows

On my Arch Linux system, I installed Windows 10 afterwards. Therefore, Windows overwrote the EFI partition and I had to set it up again (because my Arch Linux uses EXT4, so Windows Boot Manager won't ...
4
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1answer
13k views

How to manually boot Arch Linux from preboot emergency shell?

I broke an Arch Linux installation. Let's say I made a typo in the PARTUUID string. The result is that the boot process can't mount the root file system and stops at the mkinitcpio preboot stage with ...
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1answer
824 views

Can't find initrd file on GRUB console

My PC boots to the grub command line. $ ls (hd0) (hd1) (hd1,gpt6) (hd1,gpt5) (hd1,gpt4) (hd1,gpt3) (hd1,gpt2) (hd1,gpt1) (lvm/fedora-swap) (lvm/fedora-home) (lvm/fedora-root) $ ls (hd1,gpt5)/ ...
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0answers
52 views

Why do EFI distros want to be alone in a multibooting environment?

I'm new to linux. Currently I have 4 buntu-distros on my old Mac Leopard. Every time I try to multiboot with more than 1 EFI distro I'm stuck with boot issues (that is I can't boot). So I go back with ...
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1answer
930 views

Install Grub Boot loader in different folder on UEFI!

I am new in UEFI and I moved to GPT. I am now using windows 7 and 10 in dual boot. I want to install Grub boot loader in a different folder, not in the EFI system partition/ESP. So, Windows boot ...
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1answer
1k views

EFI grub vanished, how to get it back?

I have a dual boot (Fedora & Windows 10), after a glitch from Windows, the machine only boots using the Windows' boot loader and not grub2 as before. How can I get grub2 back? What I tried: $ ...
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1answer
273 views

Determining EFI text modes supported by notebook

I am using a Lenovo Ideapad 100S IBR 14'' in FreeBSD 12.0 I need to setup a different EFI text mode, to change the screen resolution upon boot. As in this question Using native 1366 x 768 resolution ...
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4answers
6k views

UEFI not recognising EFI partition: no booting options

I messed up the EFI partition and now when I boot my computer it opens the BIOS interface without any boot option, as if my disk has been erased. However using a live USB (which is correctly ...
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0answers
734 views

system doesn't have any usb boot option Error

I want to install Linux 17 instead of Windows 10. I burned my USB with Rusuf using GPT partition scheme for UEFI. I restart my computer with shift key and choose EFI USB. When computer has restarted ...
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1answer
469 views

Portable USB HD No Bootable Device Elementary OS

Problem: I am trying to install Elementary OS Loki onto a Seagate Backup Plus Slim 2TB portable USB HD, I don't think my problem is specific to the OS. The install completes successfully (using the ...
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0answers
532 views

“error: unknown filesystem” after installing with failed update-grub on UEFI

I tried installing Debian 8.7 on my Lenovo FLEX laptop. I downloaded the Netinstall from Debian's website and wrote the ISO file to a USB stick. When I ran through the install process, it gave an ...
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1answer
751 views

EFI: Grub menu doesn't display

I ave a computer with CentOS 7 installed that boots up using EFI and grub2 (I'm not exactly sure what the difference between UEFI and EFI is). If it makes a difference the partition table is GPT. ...
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1answer
2k views

Trying to install dual-boot Parrot OS 3.5 on Sony Vaio UEFI

I'm trying to install Parrot OS 3.5 on a Sony Vaio laptop, as a dual-boot alongside Windows 10. I have no trouble installing from my bootable USB, but Grub doesn't seem to be able to load it. I don't ...
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2answers
1k views

Installing 32-bit Linux distribution on 32-bit Architecture with 32-bit UEFI

There's a lot of information on installing 64-bit Linux on 32-bit UEFI. It's a mess even here, but I've seen ways (rEFInd, etc). But this laptop (HP Envy X2) has a 32-bit architecture and exclusively ...
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0answers
375 views

Assuming drive cache

I just made a bootable USB stick with elementary os using Rufus, and I'm trying to get my Acer Aspire V15 Nitro to dual boot with w10 and yeah, not working or else I wouldn't be posting here. Anyway ...
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1answer
4k views

GRUB2 (and os-prober) doesn't find Windows 10

I just re-installed an updated version of an OS based on Debian Testing on my machine, but this time I booted the installation DVD as an UEFI(FAT) medium, so the OS was installed in UEFI-mode. I was ...
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0answers
55 views

How check EFI revision?

How can I check the (U)EFI revision (or specification version) of my laptop NB: I don't mean the EFI/BIOS version provided by the manufacturer of the laptop/motherboard
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1answer
791 views

How can I boot Debian from a USB drive from Windows 10?

This question isn't about creating a bootable USB; I already have. I followed Alexander Maru's instructions on this StackExchange post. What I want to know is how to boot Debian from a USB drive. I ...
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1answer
716 views

Fedora 25 installer wont detect SSD in UEFI. Keyboard/trackpad doesn't work in LEGACY

I have a Sony Vaio Pro 13 (Model: SVP132A1CW) with Intel Core I-5, 4GB DDR3 RAM, 128GB SSD. That model number is stated on the bottom of the laptop, although when searching the Sony support sites, ...
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0answers
677 views

Qubes installer not booting

I am currently setting up a Qubes OS in dual boot (I have read the warnings and I know if the issues of doing so) with Windows 10. After having dd'd the latest release disk on a partition of my usb ...
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3answers
9k views

(UEFI) Chainloading GRUB from GRUB

Terminology: ESP = my FAT32 EFI partition. I want to: Have a self-contained GRUB install on my ESP that chainloads another GRUB bootloader on my distro root filesystem (/). I currently have several ...