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 install dualboot linux in efi with weird ssd

I'm trying to install linux on my efi computer but still not working. I first installed Windows with 120/510 GB disk in EFI mode, and then want to install linux but every single linux just doesn't ...
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45 views

Can a 64-bit OS be loaded on a 64-bit processor when the EFI is 32-bit?

I'm struggling to get a Chromebook loaded with a new OS. The Chromebook is a Toshiba CB35-B3330, and it has a 64-bit Intel Celeron N2840. I'm struggling because I can't get any useful information on ...
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How to add booting parameters to the kernel with bcfg from the EFI shell?

efibootmgr is creating invalid entries in the EFI boot menu. For instance efibootmgr -c -d /dev/sdX -p Y -l /EFI/refind/refind_x64.efi -L "rEFInd Boot Manager" adds an unbootable japanese characters ...
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3answers
14 views

How to launch vmlinuz-linux from efi shell?

How to start vmlinuz-linux from efi shell ? I jump into the ESP and type vmlinuz-linux (vmlinuz-linux is in the ESP) but it says vmlinuz-linux isn't recognized as an internal or external command, ...
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21 views

EFI Boot Shell Doesn't Work

Currently using an MSI Z97S (not sure if that matters), but when I try to boot into a Windows 10 USB, it skips it, and if I turn on Windows 10 mode, it goes straight to an EFI shell. I did look it up, ...
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68 views

Grub2 EFI falls to Grub Shell unless I hit F12 immediately after power on

I have Opensuse Tumbleweed together with Windows 10 on my Asus ROG laptop. The issue is quite weird - every time I power on or reboot, Grub2 EFI falls to grub2 shell and randomly it doesn't see the ...
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36 views

Correcting EFI boot entry for DVD drive to install Win 7 in EFI mode?

Running sudo efibootmgr -v on Kubuntu Trusty on my old Lenovo Z570 laptop gives the following output: BootCurrent: 0006 Timeout: 1 seconds BootOrder: 0006,0005,0003,0004,0007,0002 Boot0000 Setup ...
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14 views

partition resize breaks EFI USB installer

I have a 64GB GPT USB stick, containing EFI installer partitions for Windows 7, Windows 10, 5 linuxes, and a Clover BootLoader to launch an El Capitan installer for Hackintosh. It all works ...
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46 views

Repair an error:read-only efi partition

Again stumbling from one problem to the next. I recently installing OpenSuse13.2 parallel to win10. Worked nice. Then I decided to reintall, but Suse Leap, deleting the old Suse installation. At the ...
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27 views

Installing Debian but can't boot

I'm installing Debian testing on a SSD, there is a pre-existing EFI ESP partition from windows installation, the disk uses GPT partitioning. Problem is after it finishes installing it won't boot linux ...
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32 views

How to cleanup EFI boot list

I'm reinstalling my OSes multiple times trying to setup a dual boot and my motherboard boot list starts to get ugly : 2 entries Windows boot only one works, 2 entries for linux and none work. How to ...
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Can't boot Debian after forced EFI installation

I just installed Debian with encrypted /. I made a /boot partition and converted an NTFS partition to EFI. It installed but now I can't boot on Linux. My motherboard boot list put a mirrored "N" sign ...
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45 views

A UEFI entry is corrupt. How do I fix it?

I uninstalled Windows 10 from my triple boot setup to be left with dual boot but the UEFI entry for it stayed after I removed the drive, so to remove it I used easyUEFI to remove the entry but it just ...
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1answer
19 views

Add EFI stub to vmlinuz

Is it possible to add EFI stub to vmlinuz? I've been using ipxe for network booting installation images, problem is that in EFI mode ipxe is only able to boot newer kernels with EFI stub enabled. So ...
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14 views

Cancel Boot Camp automatic boot

I wanted to install Windows using Boot Camp, I gave it the ISO image and partitioned the disk but decided not to pursue after reboot. Now everytime I power up my MacBook Pro it automatically boots to ...
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21 views

Upgrading a USB installed Windows 10 on a Mac

I have Windows 10 installed on external SSD connected to my MacBook Pro 13 trough USB. I'm trying to upgrade Windows 10 and I keep getting an error "Windows can't be installed because this PC has an ...
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1answer
269 views

Multi-Boot: How to repair Windows 10 boot after Linux Mint upgrade?

I have an triple-booting iMac (Linux Mint, OSX, WINDOWS 10) with rEFInd installed. The following partitions listed using sudo gdisk -l in Linux Mint 17.3: Number Start (sector) End (sector) Size ...
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1answer
96 views

How to install Windows 10 after Debian

I want to install Windows 10 on my laptop with Debian Jessie on it. I installed my Debian in EFI mode with graphical options. Could someone point me to a good tutorial, what I have to set, what to ...
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63 views

Mactel Fedora 23 - Debugging Slow EFI Boot

I recently installed Fedora 23 on my Macbook4,1 (early 2008 model). After the white screen/apple sound at boot, I see a black screen with an underscore cursor for about 10-15 seconds before the Grub ...
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17 views

How to get config from a EFISTUB kernel?

I am working on getting normal Linux onto a x86 Android tablet. Only kernel I can find is efilinux.efi located inside the system’s ESP (\EFI\Intel\efilinux.efi). But I can’t get config through these ...
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40 views

Removing the EFI setup from the boot order

I own a Lenovo notebook (model Z570) on which I have already used a number of Windows and Linux installations pretty well, but now its EFI boot order seems to be broken. After the recent installation ...
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69 views

efi usb boot problems with linux mint 17.2

I've created a few usb boot sticks for linux mint 17.2 a few different ways (i.e, from both windows & linux) that all work correctly when trying to boot my laptop. However, when I try to boot ...
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32 views

Restore Windows From Data Backup?

So I managed to break my partition table, but I was able to recover my entire C: drive and copy every file and folder to an external drive. My question now becomes, is there anyway to, when I ...
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39 views

Move bootmgr from one drive to another (EFI)

My computer currently boots from my HDD, then loads the system located on my SSD. In the following picture, disk 0 is my HDD that contains the boot manager, and disk 1 is the SSD I want to boot from. ...
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41 views

No disks connected, why is Windows Boot Manager still a boot option?

Title covers 98% of my question. I'm trying to figure out what the Windows Boot Manager BIOS boot option is. In doing so, I've disconnected every memory device that could possibly hold an OS, ...
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65 views

How I create an USB entry on EFI boot?

I bought a second hand Samsung Ultrabook N530U3C which the boot is not working well. The previous owner managed to install linux and make it boot, but the USB entry on the EFI boot is not working. I ...
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100 views

Can't call grubx64.efi using startup.nsh in EFI

I installed Deepin 2014.3 on VirtualBox. When I launched it I got the regular skip startup.nsh message with the counter and the prompt right after it. My grubx64.efi resides under FS0:\EFI\Deepin ...
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149 views

Boot from USB/DVD in EFI Mode

I would like to perform a clean UEFI installation of Windows from a USB/DVD. That involves reformatting the disk to GPT and re-creating the EFI sector. My question is: how to boot from a peripheral ...
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76 views

What is the method of creating a Windows-booting EFI System partition?

I thought an EFI System Partition that boots Windows (specifically Win10, but I think the concept is the similar for all NT-based Windows) was a unique type of EFI system partition that can only be ...
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24 views

How can I delete all Windows Boot Loader entries and rescan?

I have reinstalled windows multiple times (over the last install) and it adds a new entry every time. Can I delete all Windows Boot Loader entries and rescan and just add those?
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1answer
249 views

How to set a partition type to ef02 with fdisk?

Setting a partition's type to ef02 is easy in gdisk. You just type it. However, I could not find a similar type code in fdisk. I don't want to use gdisk, because it force convert my drive to GPT which ...
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27 views

UEFI but not booting directly

I was playing around with my partitions finally now it doesn't boot directly. For it to boot I need to go to HP boot menu and then choose EFI file to boot to load the OS. Something like EFI partition ...
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2answers
297 views

I want to expand a partition on my boot SSD, but there is a Recovery Partition and EFI System Partition in the way. How can I get around this?

Here is a screenshot in Windows Disk Management showing the partition layout on my disk: I wish to expand the Windows partition (C:\ drive, "Boot") into the 16 GB of unallocated space. However, ...
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256 views

Windows 10 UEFI Install on Hp Envy 14 - 1190ea

I'm trying to install Windows 10 and boot through UEFI instead of Legacy BIOS on my HP Envy 14 1190ea. For the installation I have created 3 USB sticks with rufus: The first was configured as "MBR ...
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52 views

Prevent Windows from creating another EFI System Partition

/* EDIT * I used the Windows 10 enterprise evaluation is (Build 10240) */ I already have an existing ESP but Windows doesn't want to acknowledge it, apparently. I created the ESP with GNU parted ...
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1answer
93 views

Booting from Xubuntu 15.04 installation media hangs when booting with UEFI

I want to dual boot my laptop with Windows 10 and Linux. I'm attempting to install Xubuntu 15.04 x64 but when I boot from the installation media it hangs on starting version 219 then eventually my ...
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61 views

HFS+ external drive missing EFI, will not mount on Mac

First off: Fear not, I have everything from this drive backed up. I'm just trying to reformat it, but I had someone else attempt it on Windows which doesn't look like it helped. I'm a novice but ...
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System Image Creation Fails in Windows 8.1 Pro

I just finished installing drivers, updates and softwares on a new Windows 8.1 Pro installation. I am trying to create a system image, but the process fails due to a "Volume Shadow Copy size not ...
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86 views

Windows 10 EFI partition on different HDD

I've upgraded from windows 8.1 to 10. Once the upgrade completed I wanted to create a system image backup in case anything went wrong down the line. When trying to do this it said my backup size ...
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48 views

Move Linux EFI to SSD

I have a Linux Mint 17.1 EFI installed on 500GB HDD. I would like to move it to new 120GB SSD. I resized partitions to fit 120GB SSD and did "ddrescue -v --force /dev/sda /dev/sdb" from LiveUSB but ...
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1answer
401 views

Bootloader issue - How do I completely remove Linux from my system? fully detailed description

The goal was to successfully install Windows 10 upgrade. System configuration : Dell Inspiron 3537, i5 4th gen processor, 6GB RAM, 1TB HDD, 2GB AMD Graphics. Before install : I have a Dual-boot ...
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1answer
93 views

Resize efi partition on windows

I have windows 8.1 How could I resize Efi partition on Windows because I don't have any other operating system please help
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1answer
168 views

Access EFI partition files in Linux

I am using Arch linux in dual boot with Windows 10 and I want to mount the efi partition in Arch and to delete some files from there, like old Ubuntu grub file and so on... How can I mount this ...
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1answer
273 views

install mint linux alongside ubuntu on lvm with EFI boot

I have recently moved to a new laptop (Lenovo Y50) and installed Ubunt 15.04 on it. I installed lvm so almost all the 1T HD is one logical partition. The other partitions are: ...
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1answer
312 views

Windows 8.1 and EFI, recovery partition deleted, can't boot

I have a Windows tablet PC (Odys Winpad) with 32GB HDD. I have created recovery USB disk and deleted the recovery partition (I wanted to win some more space). Now I can't boot any more: every time I ...
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2answers
443 views

MacBook Pro (Early 2011, 8,2) will not boot Mac OS X after installing Linux

Until a couple of months ago, I loved my triple-boot MacBook Pro (early 2011, 8,2 with high-resolution screen). Then I tried to run the Mac OS X 10.10 (Yosemite) upgrade and everything fell apart. I ...
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1answer
391 views

Images (e.g. with Clonezilla) of Windows and Linux on a UEFI computer

I use Clonezilla with success for many years to make images from partitions that host Windows 7 or smaller and Ubuntu and other operating systems. Making images and restore them was easy for me. But ...
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55 views

How do I replace the dump of my USB recovery media with a more simple EFI partition in this situation?

The situation is as follows: this is a new Dell Precision M3800; it comes with a Windows 8.1 pro version and a USB recovery medium; the machine uses UEFI; I immediately scratched Windows and ...
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104 views

Linux and Windows EFI - Not enough space

I already have Windows installed on my machine, and I'm trying to install an EFI boot manager such as Grub, rEFInd, or gummiboot on Arch Linux. Whenever I try to install any of these three options I ...
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174 views

Why does Ubuntu keep the old vmlinuz files? Is it safe to delete them?

So, I was deeply annoyed by the multiple boot options on rEFInd bootup (I run about 6 OSes on my mac, plus some on a USB), and I thought to myself: "Why on earth do they keep multiple boot options for ...