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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15 views

howto increase (too small) EFI partition for dual boot

Just about to setup my notebook with Fedora 31 and ran into the issue the EFI partition (/boot/efi) being too small with just 100Mb. (the EFI partition was previously setup from windows when I ran &...
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Triple Boot GRUB2/CLOVER issue

0 I have a PC on which I dual boot my Catalina Hackintosh and Microsoft on seperate SSD's. Recently I tried to install Linux Mint on a partition of my Hackintosh SSD, because I recently discovered how ...
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1answer
31 views

Deleted system reserved partition, EFI partition, and can't boot Ubuntu now

I had dual OS running on my system (the default was Windows 10, then I installed Ubuntu alongside Windows). With the intention of deleting Windows and keeping only Ubuntu, I logged in to my Ubuntu (...
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How do I boot from /dev/sdb1 rather than /dev/sda

I have a manjaro partition that I would like to install on my computer. I have it mounted on /dev/sdb1 with the boot and esp flags. However, my computer only recognizes the /dev/sda1 partition, which ...
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efibootmgr on Arch Linux incorrectly reports empty root

I create an EFI stub using (newlines just for easier viewing): efibootmgr --disk /dev/nvme0n1 --part 1 --create --label "Arch Linux" --loader /vmlinuz-linux --unicode 'root=PARTUUID=my-...
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1answer
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UEFI only recognizes /dev/sda, but not /dev/sda2, as bootable

I have two bootable partitions, /dev/sda and /dev/sda2. However, when I restart my PC the UEFI bootsystem only recognizes the /dev/sda partition. How do I fix this? I set the boot and esp flags to /...
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Pop!_OS after install missing windows 10 efi file `/boot/efi/EFI/Microsoft`

After install Pop!_OS, I can't boot to windows 10, the efibootmgr -v output is BootCurrent: 0005 Timeout: 0 seconds BootOrder: 0005,0006,9999,0000,0001 Boot0000 ubuntu HD(1,GPT,ab8f019d-3b03-42b0-...
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1answer
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Unable to install kali linux dual boot on windows 7 32 bits

sorry for english grammar mistake. I know that for dual boot secure boot must be disable to install other OS. My pc have not secure boot option so i unable to install kali os . when we want to install ...
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1answer
21 views

How can Lubuntu 20.04 LTS be installed in a USB which can boot into both- UEFI & Legacy BIOS systems?

Self-explanatory question. But please keep in mind in totally new to Linux. I really request you to answer this as though you were hypothetically going to explain to a 12 year old. Im actually 38, ...
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1answer
49 views

grub not working after EndeavourOS installation (via live USB)

I installed EndeavourOS (based on arch linux) via live USB following the guide on my /dev/sda partition where I used to have Ubuntu, which worked fine. I also have a separate HDD, my /dev/sdb ...
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1answer
44 views

Cannot access BIOS after installing Linux

Since I installed Linux on my old laptop, I cannot access the BIOS menu. I have tried fwsetup but I just get a message saying: Could not set EFI variable 'OsIndications'. I have also tried booting ...
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1answer
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Retaining vendor logo during bootiing Debian Buster

I would like to keep the UEFI logo while my Debian linux is booting, so no grub, no initramfs, no systemd messages (and no plymouth). I followed this description: https://wiki.archlinux.org/index.php/...
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os-prober Doesn't Detect Windows 10 in Archlinux [duplicate]

I installed Arch recently (as in, yesterday). I was able to successfully install Grub in the EFI system Partition with grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=grub --...
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Debian 10.4.0 live iso - Boot out-of-box using UEFI

My Desktop is UEFI enabled;CSM disabled;Secure boot disabled;Fastboot disabled; I have a working debian 10.4.0 installation Want to check Live iso boot out-of-the-box using UEFI firmware Tried with ...
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42 views

GRUB menu will not load in dual boot Linux & Windows 10 on UEFI/GPT

After updating my Dell G3 3579 bios to 1.12.0, Ubuntu stopped loading. When I checked, issue is related with BIOS/UEFI mode and MBR/GPT partitions. So, I installed both Window 10 and Ubuntu 18.04 ...
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1answer
33 views

Migrate to UEFI in Debian

Motherboard I had Debian installed on, is broken. I've installed another motherboard, but it only supports UEFI boot. I have no UEFI partition, I don't know if I have GPT. I'm able to boot (from USB -...
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1answer
32 views

Debian 10 freezes when I try to reboot (dual boot machine)

I have been working on installing dual boot on my Acer Nitro AN515-51 laptop (with pre-installed Windows 10) for several days now, and am hoping some of you Linux gurus can help a very frustrated (but ...
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1answer
91 views

Why does the kernel lockdown prevent hibernation?

In my systemd jounal (journalctl) I often see this message: hibernation is restricted; see man kernel_lockdown.7 This seems to stem from the kernel lockdown feature that (only?) is active when you ...
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2answers
22 views

What is the difference between ASUS Boot Menu items

When I use F2 to enter UEFI settings after boot, the ASUS boot menu shows me a list of available boot items. I have a USB drive inserted and I see 2 related items to it: Generic Flash Disk (15000MB) ...
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1answer
28 views

What is the relationship between COREBOOT and SEABIOS

I am interested in investing in hardware that supports libreboot, and I understand that it's a fork of coreboot with firmware blobs removed, however I do not understand what seabios is. I did some ...
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1answer
13 views

Can I require binary X to be booted only by a bootloader signed with key Y?

If I include Microsoft's keys in my secure boot setup, then any malware which has a Microsoft key can boot my Linux binary. Can I restrict my Linux binary to be booted only by a bootloader signed with ...
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1answer
48 views

Grub2 starts in commanline after restart and can't find /boot or /grub

Note: read question before marking it as duplicate. It is different. I would't find answer to the question anywhere. I have windows 10 preloaded and dual booted it with ubuntu 18.04. I needed to ...
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2answers
101 views

Debugging Grub2 when boot can't even reach grub shell

I have a a problem with uefi grub2 booting, which means that the system cannot even reach grub console, let alone linux. Instead it cycles though the boot process. While I managed to 'fix' the ...
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1answer
149 views

grub-install: error: cannot find EFI directory. (Reinstalling Grub Boot Loader Windows 10/Kali Linux Dual Boot with Dual Hard Drive)

I have 2 hard drive (SSD) in my laptop. One hard drive has windows 10 installed and other hard drive has kali linux installed. After reinstalling Windows 10 my kali linux grub boot loader isn't ...
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17 views

Black Screen when Booting with EFI Boot Stub

I can successfully boot my system using systemd-boot but using an unnecessary boot loader always bothers me when UEFI should theoretically be able to do it on its own. In practice, though, using UEFI ...
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2answers
47 views

Dual boot issues with UEFI

I'm sure this question is asked a lot on here but I can't seem to find an answer/solution that has worked for me. I have Windows 10 on a Samsung 850 SSD and Linux mint 19.3 on a Samsung 750 SSD. I've ...
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1answer
44 views

After installing Ubuntu Linux on external drive, cannot reboot on internal drive without external drive

I use EFI booting on a Macbook pro. (I can't use UEFI because the machine is too old.) On the internal drive, I have Ubuntu Linux 20.04. I had the unfortunate idea to install Ubuntu Linux 20.04 on ...
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1answer
22 views

Manually enrolling Debian KEK

I dual booted Ubuntu on my spare disk (next to main Ubuntu disk) to check if I am going to convert the main instance away from Ubuntu. One of the reasons I chose Debian is because it supports ...
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1answer
43 views

Black screen after booting archlinux installation program from usb drive

Trying to install Archlinux on my laptop, I get a black screen after I pick Arch Linux archiso x86_64 UEFI CD and hitting Enter on the boot menu. I waited for about 10 minutes and the black screen ...
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1answer
28 views

Can't delete UEFI variable - no space left / operation not permitted

I'm installing Arch Linux on a new machine, and I've gotten to the point where I need to configure the bootloader, however this is failing: # bootctl install Failed to create EFI Boot variable entry: ...
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Can I delete Ubuntu partition from dual booted PC if Ubuntu configured my UEFI Secure Boot?

I installed ubuntu along side windows 10 and kept the boot manager in the partition in which i installed ubuntu. So, by default, windows 10 boots. When I specifically go to boot menu and select ubuntu ...
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19 views

How to install Ubuntu on an external HDD partition?

I'm trying to install Ubuntu on my external hard-disk. Since I already have some files on that HDD, I created unallocated free space in order to install Linux on there. I am able to install it, ...
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Bootloader vs boot manager

It seems that "bootloader" and "boot manager" are commonly interchanged. I know that rEFInd is a boot manager and not a bootloader. I know that grub2 is a bootloader and I think that it's a boot ...
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54 views

Replacing systemd-boot with GRUB2

i would like to install GRUB instead of syestemd-boot in my PopOS installation (there is not a real reason why, i like GRUB more and i would like to learn how to work with bootloaders a little bit ...
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fixing grub2 boot menu from missing grubx64.efi

I have a server, with EFI, that has one operating system disk running RHEL 7.6. It is partitioned like this /dev/sda1 XFS /boot 1gb /dev/sda2 EFI /boot/efi 100mb /dev/sda3 XFS / ...
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fixing missing grubx64.efi and the grub menu rhel 7

I had a work server, supermicro having EFI, fail to boot it's one hard disk having RHEL 7.6 x86-64 because of a missing /boot/efi/EFI/redhat/grubx64.efi file. I am using a spare SSD on a spare ...
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System bootorder not founded

I already had Windows 10 installed on my PC. Recently I installed Ubuntu 18.04 alongside Windows. After completing the installation the PC is unable to boot; I get this message at startup: System ...
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24 views

How to build a mirror vdev which is bootable via UEFI?

I have a server with two identical disks. I would like to create a ZFS mirror vdev from these disks, create a ZFS filesystem on it, use it as the root filesystem and boot from it. I have done this ...
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2answers
50 views

missing grubx64.efi

I rebooted my supermicro server and it failed to boot my linux disk. Within the BIOS/EFI I can navigate to the one operating system disk and see the EFI partition and of all the .efi files listed but ...
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15 views

ARM64: Does EFI-Stub choose any address calculated with a random number?

[ARM64] I am trying to boot the kernel from GRUB and it goes through the EFI-Stub loader. The EFI bootloader I am using includes an implementation for EFI_RNG_PROTOCOL and CONFIG_RANDOMIZE_BASE is ...
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1answer
850 views

This GPT partition label contains no BIOS boot partition

I am to a dead end with a bricked laptop. Yesterday after a boosted fan madness and unresponsive desktop, the laptop would not start again properly; dpkg does not repair anything nor it is recognized ...
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63 views

Hardware error from APEI Generic Hardware Error Source

I have the following log: localhost kernel: {6}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 512 I want to know where to find the 512 mapping to something? Is that a ...
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1answer
66 views

How to add Ubuntu to Arch Linux grub (dual boot) (UEFI)

I want to have Dual Boot, the problem is that if I install Arch Linux after Ubuntu I don't know how to make that Arch Linux detect Ubuntu. I partitioned Ubuntu in this way In Arch I only create root ...
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28 views

Setting up LinuxMint/Win10 dual boot

I recently bought a new PC with a 1TB NVME drive and want to set-up a dual-boot system with Linux Mint and Win10. My old PC ran solely on Win10 from an SSD with an additional HDD for data storage. For ...
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1answer
130 views

How to analyze firmware time in systemd-analyze?

Running systemd-analyze on my computer gives me Startup finished in 15.862s (firmware) + 3.356s (loader) + 1.391s (kernel) + 5.199s (userspace) = 25.810s. The time for firmware is taking longer than I ...
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31 views

Cannot find bootable device - can't boot from USB - can't update BIOS - no grub

I was wondering if anyone could give me some advice on how to proceed with this faulty installation. I have Dell Inspiron 15 5570 that had a while ago Linux Mint installation on it. The installation ...
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0answers
11 views

booting different images per IP with grub netboot

If I netboot a host with legacy bios and pxelinux then pxelinux looks for it's config in pxelinux.cfg/C, pxelinux.cfg/C0, ... pxelinux.cfg/C0A81FC9, pxelinux.cfg/default. 'C0A81FC9' is the IP of the ...
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1answer
107 views

Problems with GRUB and Windows Boot

I have been dual booting Windows 10 and linux (KDE Neon) on my computer with no problems for a few months. However, today, after booting into linux, then restarting and attempting to select windows, I ...
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0answers
105 views

How to boot 32-bit Linux kernel on 64-bit UEFI system without CSM

I have a system on which I have to run a 32-bit Linux kernel, as it needs to interact with obsolete hardware which only have a 32-bit driver available. Changing the driver is not feasible. The Dell ...
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1answer
24 views

Creating a script that runs on insertion of bootable medium (USB / External Harddrive / CD)

Say I have a script script.sh. How can I make it execute whenever a bootable medium is inserted? So lets say I stick a bootable cd into my PC, I want script.sh to run on insertion without rebooting my ...

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