Questions tagged [grub]

GRUB (GRand Unified Bootloader) is a multiboot bootloader from the GNU project. This tag is for questions relating to the legacy version of GRUB. Use the GRUB2 tag for questions dealing with GRUB2, a rewritten version.

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69 votes
6 answers
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Boot from USB using GRUB

My friend's laptop was in a car accident (he's fine!). However the laptop is very old its an Acer Aspire 1520 the CD-rom drive is broken and there is no floppy drive. I made him a USB boot before I ...
user685590's user avatar
67 votes
7 answers
207k views

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

There seems to be quite a bit of discussion about this but I can't find a simple answer. When I try to install grub2 I get this error: # grub2-install /dev/sda Installing for i386-pc platform. grub2-...
Robert S's user avatar
  • 837
49 votes
4 answers
573k views

How to fix the Windows 10 boot loader from Windows

I installed Ubuntu on a system that has Windows 10 installed. I can boot to Windows or Ubuntu normally using GRUB. I want to delete Ubuntu partition, but first I must restore the Windows 10 MBR. In ...
Codyfly's user avatar
  • 591
49 votes
3 answers
154k views

grub: boot from ISO

How can I boot into an ISO file in GRUB? The ISO file is on a reiserfs partition and GRUB can access it (already tested that).
Albert's user avatar
  • 6,651
37 votes
4 answers
42k views

"Unable to find root device" on a fresh ArchLinux install

I have installed the latest version of ArchLinux (2014.06.01) on a MacBook Pro 8,1 (15", if that matters regarding hardware) dual-booting with OSX following the instructions in the official install ...
hlt's user avatar
  • 864
36 votes
2 answers
48k views

How do I check the current boot parameter list in Linux?

During test, I sometimes add/change boot parameters to /boot/grub/menu.lst (suse), or at the grub screen during boot. How do I check what boot parameters have been used after the system is done ...
peonicles's user avatar
  • 535
36 votes
8 answers
181k views

How to make UEFI bios start GRUB, not Windows?

The TL;DR, added in the edit: The question is: How can I make the BIOS prefer GRUB over Windows Boot Manager on the same UEFI boot partition? The problem is not with Grub; Grub does the right thing ...
Jon Watte's user avatar
  • 845
29 votes
3 answers
10k views

Why do we need a boot loader?

After the BIOS, or something similar that serves as a firmware, is started, the control is passed to the bootloader, as far as I know. Why can't the BIOS load the OS kernel directly? Also, the ...
aoeui's user avatar
  • 291
29 votes
3 answers
39k views

How to install grub into an .img file?

I did the following: created an empty .img file with dd associated it to /dev/loop0 with losetup created a partition in it with fdisk formatted such partition with mke2fs copied a custom GNU/Linux ...
Francesco Turco's user avatar
27 votes
8 answers
228k views

boot Windows from GRUB rescue

This is my situation: installed Ubuntu without a CD (using unetbootin) dual boot installation (Windows XP+Ubuntu) didn't like the installation and decided to boot into Windows and delete the Linux ...
pruefsumme's user avatar
27 votes
7 answers
72k views

How to add a new kernel to grub2

How can we add a kernel to grub2? i knew the stuff we could do with the former versions, but it seems to have changed. What files should we edit?
Amir Zadeh's user avatar
26 votes
2 answers
185k views

How to add Windows 10 to grub boot loader?

I have installed Windows 10 I have installed Linux Mint Silvia and I have chosen a device for boot loader installation - sda. There is not Windows 10 in grub menu when the system starts I have booted ...
user avatar
26 votes
2 answers
101k views

GRUB: how find partition number (hd0,x)?

i am playing with grub and i change the root using: root (hda,x) how can i know what's x for /dev/sda7 ? fdisk -l Device Boot Start End Blocks Id System /dev/sda1 * ...
Alexar's user avatar
  • 439
25 votes
4 answers
3k views

Why is it possible to change the password of an admin user on linux?

A few days ago, a friend of mine, wanted to show me that he can use my linux even if I don't tell him my password. He entered in GRUB, selected the recovery mode option. My first problem is that he ...
Ilea Cristian's user avatar
25 votes
2 answers
65k views

Reconstructing Windows EFI files in /boot partition (Linux+Windows dual boot)

I'm dual booting Windows 10 (pre-Anniversary Update) and Fedora 24 on a Lenovo IdeaPad N580 (Intel Pentium B960 2.2GHz, 4GB RAM, UEFI with Secure Boot disabled). I originally had just Windows 10 and ...
TheInitializer's user avatar
21 votes
5 answers
4k views

Is it possible to "return" to GRUB after booting Linux without restarting

I am dual-booting Windows and Linux on my SSD and find myself often switching between the two OSes. The SSD is really fast and both OSes boot in about 3 seconds once selected in GRUB. However, it ...
Dimitar Asenov's user avatar
19 votes
2 answers
23k views

How should I set up my dual-boot so that I can hibernate the secondary OS?

So, my previous setup was a triple-boot of Windows 7, wubi-integrated ubuntu, and then fedora on the last partition using LVM. I have tired of not being able to access my Windows files from ubuntu (...
WindowsEscapist's user avatar
17 votes
4 answers
5k views

How to edit .bashrc without logging in

This is probably a duplicate question, but I'm not familiar enough with the login/boot process of CentOS (especially on a VM) to know what to search for. I'm running CentOS 7 in VirtualBox. I ...
Michael Hoffmann's user avatar
17 votes
4 answers
26k views

Ubuntu Server installed from USB puts GRUB on the USB drive instead of the hard disk

I've just tried installing Ubuntu Server onto my new PC. The PC doesn't have a CD ROM drive, just USB, so I used a USB installation of Ubuntu Server. When I install it, it allocates dev/sda as being ...
Paul's user avatar
  • 283
17 votes
2 answers
114k views

How do I list my devices in GRUB?

I am trying to boot my own simple OS kernel using GRUB stage2_eltorito. However, the compiled ISO simply leads to a GRUB prompt. I looked up online, and I saw I need to load my kernel. However, when I ...
Safal Aryal's user avatar
17 votes
2 answers
14k views

Can Grub be configured to remember the last OS you booted into?

I typically have 2-3 OSes in my boot menu: Ubuntu 10.04 Windows 7 [Sometimes, a third option, such as Ubuntu 10.04 Netbook] If I am in an OS other than the default choice (Windows 7 in this case), ...
Matthew's user avatar
  • 14.8k
17 votes
3 answers
8k views

Boot to Windows once from Grub then back to Ubuntu on next boot

I do a lot of remote work on computers and my home comptuer has 2 OSes: Ubuntu and Windows 7. I would like to be able to switch to Windows occasionally but this is impossible without losing my ability ...
Jeff F.'s user avatar
  • 4,413
16 votes
1 answer
2k views

Why doesn't installing GRUB on MBR destroy the partition table?

I have read that my partition table is stored in the MBR. And write operations are performed sector-wise i.e, even if you want to change just a few bytes of a sector you need to overwrite entire ...
Akash Karnatak's user avatar
16 votes
3 answers
28k views

Marshmallow in VirtualBox:installation stuck on GRUB

I'm trying to install android-x86-6.0_20160129.iso in VirtualBox but the installation get stuck at Do you want to install boot loader GRUB Some background: The VM was created from the Ubuntu 32-bit (...
Dr. Gianluigi Zane Zanettini's user avatar
16 votes
5 answers
67k views

How would I reinstall the grub-efi bootloader on Fedora Linux?

I recently installed Fedora 18 using EFI boot. Like the other current linux distributions, it sets up GRUB2 for me. I have experience with re-installing the BIOS version of GRUB when things go wrong....
sourcejedi's user avatar
  • 3,272
15 votes
5 answers
68k views

What is hd0 and sda/sdb in Linux?

I'm completely new to Linux, and am using Ubuntu 10.04. I'm confused when to use what (hdx,y) to represent which hard drive. I have 2 hard drives, the first one is identified as /dev/sda (in Disk ...
Senix's user avatar
  • 198
15 votes
4 answers
61k views

How to make my old hard drive non-bootable?

Frequently my BIOS for some reason tries to boot to my old hard drive instead of my new SSD. This is starting to get very annoying have to switch hard drive priorities every time I restart my computer....
Jonathan Beaudoin's user avatar
15 votes
1 answer
44k views

How to quit GRUB minimal BASH-like mode and go back to menu?

I hid GRUB on boot so that I can press ESC to show the menu only when I need it. However, pressing ESC too many times will take me to the GRUB prompt and it's hard to press exactly once during the ...
Frederick Zhang's user avatar
14 votes
4 answers
120k views

How to install GRUB from inside Windows 7

I am trying to make a kernel in Visual C++ (Windows) using the tutorial here. What I am wondering is how to install GRUB from within Windows 7. If I have to download Puppy Linux or something I will, ...
elijaheac's user avatar
  • 259
14 votes
3 answers
11k views

How do I get grub to boot Windows from a second hard drive

I normally boot into Linux using GRUB and have Linux on the first hard drive in my machine. I have Windows installed on a second hard drive and am trying to get GRUB to boot the second hard drive. The ...
David Dibben's user avatar
14 votes
4 answers
8k views

Reducing video mode switching during Linux boot

When I boot up my desktop computer, which only has Linux on it, the video mode and/or console font gets switched four times: When GRUB starts, it switches from 80x25 text to a graphical mode so it ...
zwol's user avatar
  • 1,278
13 votes
3 answers
30k views

With Centos 7 as a Virtualbox guest on a Mac Host, how can I change the screen resolution of the console / command line?

I am using the minimum install of CentOS 7 with command line access only (no graphic support installed). After spending hours reading online about editing grub files, installing guest additions, and ...
user658182's user avatar
13 votes
4 answers
81k views

How can I change the default boot menu option from the GRUB command line?

I have a dual Windows 7/Ubuntu system which I almost always boot into Windows. When I boot into Ubuntu it makes memtest the default boot menu option. While this is annoying, I could live with it if I ...
Matthew Murdoch's user avatar
13 votes
3 answers
138k views

How do I change which monitor my computer uses at boot?

I have two monitors connected to my PC: One computer monitor via DisplayPort and a TV via HDMI. The TV isn't in the same room as my PC, so it's pretty tough to select which operative system to launch ...
Hubro's user avatar
  • 5,776
13 votes
2 answers
25k views

IOAPIC[0] not in IVRS table

I have a fresh Ubuntu install from USB. When I boot the PC it takes me straight to GNU Grub, when I select Ubuntu I get the following messages. [Firmware Bug]: AMD-Vi: IOAPIC[0] not in IVRS table [...
Maria Warnes's user avatar
13 votes
2 answers
8k views

How to copy VirtualBox VDI contents to a partition and dual boot the OS from it?

I'm a Linux user but I keep a compressed Windows XP ISO with me on a pen drive for the case I absolutely need Windows to do something. This works in VirtualBox most of the time. But now I want to ...
Calmarius's user avatar
  • 948
12 votes
6 answers
107k views

How to boot a Linux system without graphical server

I'd like to know what should be done to boot a Linux system on a CLI environment, without also starting the X graphical server. I'm interested in a temporary-only solution, ideally a command, or a ...
Sekhemty's user avatar
  • 9,386
12 votes
1 answer
31k views

Documentation about rd.lvm, rd.luks, and rd.md kernel boot parameters

I was searching for documentation on how the options rd.lvm.lv, rd.luks.uuid, options work, but could not find anything relevant. The official GRUB documentation does not mention them. After ...
Daniel Dinnyes's user avatar
12 votes
2 answers
14k views

Windows 8 + Linux Dual Boot under UEFI BIOS

My intent in a very near future is to set up a dual boot system with Windows 8 and Debian Linux (for testing purposes) on a Lenovo Ideapad 205, that has UEFI BIOS. I saw several articles about the ...
TheUnexpected's user avatar
11 votes
2 answers
14k views

GRUB in MBR or Partition?

where should i install GRUB? MBR or Partition Boot Sector? What are the advantages and disadvantages of each approach? Also, if we install the GRUB in the Partition Boot Sector then how the boot ...
MA1's user avatar
  • 1,129
11 votes
2 answers
4k views

Make grub keep its default boot under kernel updates

I dual-boot my machine and I want it to default to boot into windows so that whenever I restart the machine remotely from my home it will be able to get back into Windows (instead of Ubuntu). The ...
reprogrammer's user avatar
11 votes
2 answers
16k views

How to install GRUB command-line tools on OSX?

I need access to grub-mkrescue for a project I'm working on. I know that the GRUB command-line tools come builtin to Linux, but how do I get them on OSX? Is there a package? Is it built into the ...
beakr's user avatar
  • 291
10 votes
2 answers
58k views

How do I move the Windows 7 Boot Files (bootmgr, ...) to a different drive?

I wanted a dual-boot setup. So first I installed Windows 7 on the 1st partition of one hard drive (we'll call it HDD1), and then I went to install Ubuntu 9.10 on the second partition of HDD1. ...
red.october's user avatar
10 votes
7 answers
24k views

How can I change console shell's resolution in ubuntu 9.10

How can I change console shell's resolution? By this I mean the shell when you Ctrl+Alt+F1. I'm running Ubuntu 9.10, I thought this could be done by changing grub's menu.lst file by with grub2 I ...
Alan Featherston's user avatar
10 votes
3 answers
8k views

Aesthetically editing grub.cfg

EDIT: (for clarity) I'm looking to change the appearance of the grub boot menu, by editing the configuration files (possibly but not necessarily grub.cfg). So, any ubuntu user knows how filled up ...
Malabarba's user avatar
  • 8,668
10 votes
2 answers
11k views

HDD Power-Up in Standby: prevent from spinning up

On my Linux Mint 17.1 system I am using a Western Digital WD20EZRX HDD for backup. To minimize power consumption and to extend drive endurance, I want the HDD to normally be in spun-down standby state,...
Finwood's user avatar
  • 203
10 votes
2 answers
22k views

Change the keyboard layout of GRUB in stage 1

I installed grub on a EFI based system. So I have the EFI partition on /dev/sdc2 and my LUKS container in /dev/sdc5. I have only one linux partition in the LUKS container. So even /boot with the stage ...
XenGi's user avatar
  • 103
10 votes
4 answers
61k views

How can I restore my "Unknown" partition type, back to NTFS?

Lately I've been having trouble restoring my PC after uninstalling GRUB, and an Ubuntu install from it. Usually I don't encounter any problems when doing this, but this time is different. My Windows ...
Alan's user avatar
  • 211
10 votes
2 answers
36k views

GRUB Bootloader with root LUKS encryption: Only grub shell

I would appreciate help and hints to solve a problem with the GRUB bootloader. I have a system with root LUKS encryption. Means that except the partition with the bootloader, the whole system is in ...
EccoB's user avatar
  • 151
10 votes
1 answer
78k views

Installing Windows x64 on 32-bit UEFI (EFI-IA32) via GRUB [duplicate]

I am attempting to install Windows 10 x64 (64-bit) on a device that only has 32-bit UEFI (for the moment) Since x64 Linux can be booted via a custom 32-bit GRUB.. I assume it could also do the same ...
goofology's user avatar
  • 571

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