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How does UEFI know which bootloader configuration to use

UEFI is system firmware and GRUB is a bootloader built to conform to the firmware. GRUB with BIOS takes the form of boot code inside the MBR and before the first partition. With UEFI, GRUB can take ...
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2 votes
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How to make a recovered Ubuntu file system bootable again?

You will likely need to reinstall GRUB using grub-install, as the tarball only included half of it – after the restore, your /boot has GRUB modules for the old version, but your disk's MBR (and the ...
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2 votes

Dualboot only finds Windows after Clonezilla restore

I've found some explanation of what might have cause your problem: Clone entire disk to image using clonezilla and keep bootloader(s) And here's a guide to restore the MBR so you can choose the OS ...
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  • 158
1 vote

Peppermint OS boot failure because of disk encryption

It is an unforeseen conflict between the live-tools package and update-initramfs. In the PeppermintOS release from 02 February or 19 February, 2022 before starting the install ... While in the live ...
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1 vote
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Peppermint OS boot failure because of disk encryption

Found the culprit: after reading an article about adding key file to avoid to enter password again, which you can find it Here (Section 4) I decide to look around a bit before any modification were ...
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  • 21
1 vote

Windows neither showing up in BIOS nor Grub

Since you have the Recovery disk, you may run Startup Repair. You need to boot into Advanced Startup > Troubleshoot > Advanced options > Startup Repair. For more information and screenshots, ...
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  • 407k
1 vote

Windows neither showing up in BIOS nor Grub

Your assumption is valid: installing Linux installed a "hook", i.e., grub, in the booting process, so that grub(2) points to either Linux or Windows. Though you could manually modify ...
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1 vote

BitLocker & Dual boot

If Secure Boot was originally enabled for Windows, make sure it's still enabled. Then select Windows from the firmware boot menu – not from the Ubuntu GRUB menu. Do not enter the firmware setup screen ...
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  • 377k
1 vote

Laptop won't start when Ubuntu SSD is unplugged - move grub

It's normal as GRUB is installed on your SSD. Change your Boot Order in UEFI/BIOS and recheck the behaviour. But you will still need to select from the boot menu if you want to switch OS regularly. I ...
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1 vote
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VirtualBox does not boot hybrid GPT/MBR, neither EFI nor MBR

Selecting an AHCI controller for the virtual disk originating from the physical USB was solved.
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  • 21
1 vote

Laptop bricked after uninstalling dual boot

I have an Acer Swift 5 running windows 11 I wanted to install Manjaro for dual booting, ... I later changed my mind Windows 11 must maintain UEFI (and so GPT) and Secure Boot. Trying to go back to ...
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  • 36.4k
1 vote

Cant get back into windows 10 when deciding to stop arch install

As a general comment, with Windows 10 you don't need to dual-boot in order to try Linux. You could instead install and use Windows Subsystem for Linux (WSL). If you want to also run graphical ...
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  • 407k
1 vote

How to remove GRUB and boot windows 10 directly from C drive?

From the photo you added you still have the partitions meaning you can safely restore windows boot loader from recovery mode via the installation media, I recommend searching in Google or YouTube for ...
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1 vote

GRUB/EFI - Divide & Conquer, smart multiple boot solution

Is there an adequate way to partition a HDD in such a way that every Linux distribution I install has its own GRUB You can keep the boot folder in root drive itself.Configure distros to have a common ...
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1 vote
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fsck from initramfs console with 'f' key not working

If you are running full bash (including printf), you can do "$(printf '\146')sck" Well, d’oh; that doesn't work if you can’t type the f in printf. Since your question focuses on the ...
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1 vote

initramfs-4.18.0-305.19.1.el8_4.x86_64.img not found

The solution was as simple as though. Boot with a kernel that works (Press [ESC] to see available boot entrys on startup) Rebuild initramfs with dracut dracut /boot/initramfs-4.18.0-305.19.1.el8_4....
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  • 225
1 vote

I accidentally deleted the bcd file for Windows 10

If you have ever created a recovery disk for the computer, now is the time to use it. If you haven't, then you absolutely need a Windows 10 installation media. Perhaps a friend could help you in ...
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  • 407k
1 vote

Restoring the partition table and a fsarchiver backup from a dead disk to a new one

It looks like the .grubparts file is from the wrong disk. Your "old" partition list shows a normal MBR-format partition table, but what you restored looks like the "protective MBR" ...
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  • 377k
1 vote

Dual boot with Linux and Windows 10

Whatever is the boot partition, be it BIOS or UEFI, the boot partition is one and only one. After booting from it, the boot software will evoke the bootloader for the chosen operating system from its ...
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  • 407k
1 vote

Can I have an operating system on a USB that will boot up only when the USB is connected?

Do you mean you want your session to persist, so you can, for example, save documents, email, etc. to the USB, and install programs that will be available the next time you boot from it? If that is ...
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1 vote
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Missing windows boot options

+1 asks the 'chainloader' command to load the 1st sector of the partition. But your computer uses EFI firmware – it doesn't use boot sectors, so "+1" will do nothing useful at all. Instead, ...
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  • 377k
1 vote

Stuck in Grub Rescue

Yes. Insert your cd and boot from that cd. To boot from that cd, restart and keep typing f9 as soon as the windows logo appears. This key might be different, based on your laptop model. Now enter ...
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1 vote

triple boot 2x Windows10 + Linux with EFI - using grub or Windows Bootmanager

rEFInd I have a MacBook, with triple efi boot, lnx, win, osx Monterrey and with full disk encryption, possibility to boot boot older bios USB disks also with disk encryption.... Note: turn off all efi ...
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  • 11
1 vote

Wider screen resolution on Fedora running on Hyper-V in Windows 10

On the host you first need to set the resolution; power down the target VM first, then: Set-VMVideo -VMName "Fedora34" -HorizontalResolution 2560 -VerticalResolution 1200 -ResolutionType ...
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1 vote

grub2-install: "this GPT partition label contains no BIOS Boot Partition"

I had this problem just now on an EFI-mode machine with a GPT disk (Ubuntu 18.04 Server), which one day decided to boot only as far as the GRUB shell on its own. Somehow, grub-pc (for BIOS-mode / i386 ...
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  • 121
1 vote

How to replace GRUB boot loader, from within Windows?

The most simple way would be to use a Windows PE (Preinstalled Environment). It doesn't matter which version, as it is standalone like a Linux-Live-environment. While you can do it by hand it would ...
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