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.

Filter by
Sorted by
Tagged with
10
votes
4answers
8k views

What should I do before dual-booting Windows 7 and Debian on EFI?

I'm about to purchase an Asus motherboard with EFI firmware and wanted to prepare myself for installing Windows and Debian once the hardware arrives. I was hoping that someone who has gone down this ...
73
votes
16answers
486k views

GRUB starts in command line after reboot

I installed Linux Mint on my laptop along with a pre-installed Windows 10. When I turn on the computer, the normal GRUB menu appears most of the time: But after booting either Linux or Windows then ...
34
votes
7answers
153k views

"EFI variables are not supported on this system"

I am attempting to install Arch linux to a new (and very crappy) HP Pavillion 15 Notebook. This is a UEFI-based machine. After several swings at it, I have managed to get pretty far. Legacy mode is ...
60
votes
2answers
65k views

How to know if I'm booting using UEFI?

I was searching, but didn't find an obvious way to know if GRUB is using UEFI in the system boot, or the BIOS compatibility mode, or a full fledged BIOS. I found only Windows methods. Is there ...
21
votes
1answer
22k views

UEFI + BIOS bootable live Debian stretch amd64 with persistence

All of the information I currently find on this matter is insufficient for my taste. It is either outdated, misleading or even wrong, seems overly complicated or not covering this specific question. ...
3
votes
6answers
58k views

Kali Linux is Installed but not showing in boot manager

I recently bought a new Laptop: Lenovo IdeaPad 320e Intel i5 7200 2.5GHz processor 8Gb RAM 2Gb NVidia 940mx Graphics 1TB HDD It came with freeDOS so i installed Windows 10 on it on EFI mode. A few ...
8
votes
4answers
12k 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 ...
36
votes
8answers
148k views

Why is USB not working in Linux when it works in UEFI/BIOS?

For background I have just built a new machine with modern hardware including: AMD FX-8350 Gigabyte GA-990FXA-UD3 motherboard 16GB RAM NVidia GTX 650 Ti Kingston SSD Given that, I tried to install ...
18
votes
1answer
31k views

Dual boot windows on second harddrive, UEFI/GPT system

I'd like to install linux, but I don't want to risk damaging my current windows installation as I have heard a lot of horror stories. Fortunately, I have an extra hard drive. Can I install linux ...
16
votes
3answers
47k 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 ...
5
votes
5answers
4k views

How to modify an installation ISO and keep it bootable?

I know there have been quite a few similar questions, but they aren't specific enough. I have a Windows 10 x64 installation ISO and I am trying to extract the files make some modifications and then ...
2
votes
2answers
6k views

how to achieve optimal alignment for emmc partition?

We have bbb based custom board containing eMMC. And we have created partitions as follows, parted --script -a minimal /dev/mmcblk0 \ mklabel gpt \ mkpart primary 131072B 262143B \ mkpart ...
33
votes
1answer
49k views

Can GRUB2 share the EFI system partition with Windows?

I have an existing Windows 7 GPT installation, which already has a EFI System partition. I am now trying to install a Linux on a separate harddisk, which is also GPT formatted. I did not find any ...
5
votes
3answers
20k 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 ...
14
votes
2answers
28k views

How to clean up bootloaders & UEFI entries from other installs?

I got a new Windows laptop, and I wanted to dual boot with Linux. I installed Fedora, before changing my mind and going back to Mint. I'd like to keep Win 8.1 and Mint. However, now my UEFI boot menu ...
7
votes
1answer
12k views

UEFI install (14.04) boots to GRUB command prompt, no GUI

I just installed zorin 9 core (14.04) on my Hard-Disk in UEFI mode. But, when I boot, all that comes up is a GRUB2 command line. I've searched for solution and came up with this command configfile (...
3
votes
0answers
723 views

Questions Regarding UEFI Shell - Version 2.0 Wanted

I bought a cheap laptop for myself last Christmas, just because I wanted a laptop. A Toshiba Satellite C55-A5310 on special. I'm also a big believer in OEM software for laptops, so I left Windows 8.1 ...
4
votes
3answers
295 views

How do I create a utility USB?

I do a lot of work with many different bootable images all on different flash drives. However, it gets annoying to search for a specific drive, plug it in, and use it. Is there a way I can consolidate ...
2
votes
1answer
119 views

Why are so many boot options in my bios?

Boot into bios setting: It shows so many boot option--UEFI OS in the menu,almost all of them is redundant,how can delete them ? I don't like the way to unplug cmos battery and plug to reset.
1
vote
1answer
480 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 ...
1
vote
1answer
4k views

RHEL Installation issue with UEFI on HP Compaq Desktop

I have bought a new Desktop HP Compaq Elite 8300 SFF. It came with Windows 7 Pro installed. Now I want to install Linux (RHEL) by dual booting it. I have successfully shrinked the partition and ...
1
vote
1answer
19k views

grub-install error: modinfo.sh doesn't exist [closed]

I entered the following command grub-install --target=x84-64-efi --efi-directory=/boot/efi --bootfloader-id=grub But I get the error grub-install: error: /usr/lib/grub/x84_64-efi/modinfo.sh doesn'...
0
votes
1answer
1k views

Can the EFI System Partition be a logical partition on MBR disks?

I'm finding a lot of information concerning the ESP inside GPT disks, but none about them being inside an MBR based disk as a logical partition. The thing is, I don't want to convert my disk to GPT ...
13
votes
1answer
9k views

Installing FreeBSD alongside Linux

I am using Arch Linux with GNOME, I want to install FreeBSD alongside Arch Linux with the following requirements : I want to keep the Linux GRUB and add an entry of FreeBSD to it. I want to use ...
38
votes
7answers
8k views

Why do most distributions chain UEFI and grub?

Most distributions install a additional boot loader on an UEFI system. UEFI itself is a boot loader, it offers a menu to select different operating systems or individual kernels. Furthermore, the UEFI ...
13
votes
2answers
22k views

How to recreate EFI boot partition?

I've installed Fedora on my machine with / partition, swap partition and ESP partition for EFI booting. Now, I was installing Elementary OS instead of Fedora. I have formatted the / partition (/dev/...
3
votes
1answer
20k views

How do I repair grub2 (not) booting 32-bit EFI on a 64-bit machine?

I have an Asus EeeBook X205TA which proves very difficult to install Linux on due to obscure new hardware and 32-bit EFI on 64-bit hardware. I have seen and read a lot of material and I am almost ...
18
votes
2answers
2k views

The UEFI & SecureBoot impact, how severe?

I'm planning to buy a new laptop in the coming days, and I'm quite impressed with new, cool Ultrabooks. As a long-time GNU/Linux user, I'll of course install a distro of my choice on it. Chances are ...
15
votes
1answer
40k views

Timed out waiting for device dev-disk-by\x2duuid-C829\x2dC4C1.device

I had formatted efi partition and installed windows again. I have dual boot Windows and Linux, then I installed the grub bootloader again from a live usb using these commands: mount /dev/sda* /mnt ...
15
votes
4answers
79k views

How to repair CentOS ? Failed to mount /sysroot

I have installed centOS 7 on my machine and I am using it for last 4-5 month it was working fine. But few days back due to power cut (un-proper shut down) there is something bad happened with my ...
11
votes
3answers
44k views

Installing linux on an 32bit UEFI only machine

I have a Intel BayTrial Z3735D tablet which comes with a 32bit UEFI BIOS. After some search I've found that most linux distro don't come with a 32bit efi file. How can I insert one (or build a new ...
6
votes
6answers
68k views

Restore EFI boot partition

I am triple booting Ubuntu, Debian, and Fedora. When I installed Fedora from a liveCD I got excited and kept hitting next, not realizing I was not installing GPT, but rather LVM. After doing this I ...
14
votes
2answers
4k views

Is there a free (libre) open source alternative to memtest86+ that works with UEFI?

In light of memtest86+ not working with UEFI, is there an open source alternative or something I can use from grub to test memory?
9
votes
3answers
11k views

How to write/edit/update the OsIndications efi variable from command line?

In the need to enter the UEFI firmware setup utility while using ultra fast boot (keyboard drivers are not loaded during POST), I wish to write to the "Os Indications" efi variable. My OS is Ubuntu 14....
2
votes
1answer
11k views

Installing debian 7 besides windows 8

I bought a VAIO laptop which Windows 8 preinstalled on it in UEFI mode. Now I want to install Debian 7 besides Windows 8 but when I entered to the Partition Setup of debian setup menu, there is a ...
10
votes
3answers
30k views

arch Linux boots into grub command line

I'm trying to install Arch Linux over virtual box guest machine in a UEFI mode. I've followed beginner's guide to install base system, generate fstab and etc and my system now boots into grub command ...
10
votes
1answer
10k views

How does grub2 find its configuration file in EFI boot?

There are bazillions of grub2/EFI threads on the net, but I found it difficult to find an answer to the question above. We have been told that in grub2 the configuration file is /boot/grub/grub.cfg. ...
6
votes
2answers
13k views

32bit EFI with 64 bit linux OS. Can it be done?

I have a 32bit ubuntu linux install on an hp stream 7 tablet. For the sake of long term support I would like to install 64bit ubuntu linux on this device. The tablet has a 64 bit intel baytrail ...
6
votes
2answers
18k views

installed Arch Linux but cannot boot

I have installed Arch Linux for the first time, I have attempted to setup my UEFI boot process but must have failed somewhere, on bootup I do see the boot menu with the Arch Linux option but when I ...
6
votes
3answers
8k views

Partitioning EFI machine with two SSD disks in mirror

I have two SSD disks, I want to put them in a software mirror RAID. But whatever I do the OpenSuSe installation keeps telling me that due to the partitioning scheme he won't be able to install the ...
5
votes
2answers
3k views

What is the purpose of UEFI partition?

On old computers (using BIOS) we had to create 2 partitions, one to mount / and second for swap. But on new systems with UEFI we need to create third partition EFI System in addition to those two ...
4
votes
1answer
4k 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 ...
4
votes
1answer
3k views

Installing Debian with encrypted root: installer does not see EFI /boot partition

I am trying to do what I think is a pretty standard setup of encrypted / partition and unencrypted /boot using the Debian installer (for Stretch-rc1). I created /boot by selecting the option EFI ...
4
votes
5answers
9k views

grub2 gone every time I boot Windows 10

I installed Windows 7 on an SSD and upgraded it to Windows 10. Then I installed Linux mint 17.2 Cinnamon and had the following partitions: The boot menu was showing Linux Mint and Windows 10 and I ...
2
votes
2answers
9k 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 ...
7
votes
2answers
2k views

Determine what program is in my MBR code

I've done a lot of partitioning / dual booting on my Macbook Pro. Right now I have Mac OS X installed along with Ubuntu 12.04, with Grub installed on the Ubuntu partition. I am wondering - what is ...
6
votes
3answers
9k views

System freeze on reboot/shutdown

My laptop is an Acer predator helios 300 with intel i7-7700hq and an NVIDIA GTX 1050ti. It had a 128GB NVME SSD and 1TB hard disk. I had dual boot on it with fedora 29 installed on the SSD and Mint ...
6
votes
1answer
5k views

Partitioning for a UEFI boot loader, can LVM be used?

I just bought a gently used laptop and I am trying to figure out why this is. It has a single SSD that when running fdisk -l shows as Disk: /dev/sda. Under it though are 5 "devices" under that disk, ...
3
votes
6answers
33k 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 ...
1
vote
1answer
3k views

Mint UEFI partition suddenly not recognized by UEFI anymore - after booting Windows 7 once

I am dealing with a PC, some off-the-shelve HP office box, a few years old. I had been using it for a while with different flavors or Linux mostly for computing stuff headless. At some point, I had to ...