Questions tagged [grub]

This tag is ambiguous: use grub2 or grub-legacy as appropriate.

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59
votes
7answers
162k views

Set default kernel in GRUB

How can I pick which kernel GRUB2 should load by default? I recently installed a the linux realtime kernel and now it loads by default. I'd like to load the regular one by default. So far I only ...
41
votes
7answers
123k views

Equivalent of update-grub for RHEL/Fedora/CentOS systems?

In Ubuntu (and I guess in Debian too) there is a system script named update-grub which automatically executes grub-mkconfig -o with the correct path for the grub configuration file. Is there any ...
33
votes
2answers
263k views

Boot windows from grub rescue command prompt

Previously I had installed the Ubuntu 10.04 and Windows 7. Now I logged on to Windows, opened the partition editor and deleted the volume containing the Ubuntu - I thought it will delete the Ubuntu ...
31
votes
2answers
45k views

A new version of configuration file /etc/default/grub is available, but the version installed currently has been locally modified

I am using 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1 x86_64 GNU/Linux Debian GNU/Linux 7.1 (wheezy) Release: 7.1. I typed "sudo apt-get upgrade" and hoped for the best (I updated all my packages just ...
26
votes
3answers
48k views

How to switch arch linux to lts kernel?

I'm running a headless server installation of arch linux. The high rate of kernel upgrades caused me some maintainance headache and I therefore wish to switch to the lts kernel. I already installed ...
23
votes
2answers
39k views

What do the kernel parameters acpi_osi=linux and acpi_backlight=vendor do?

I had troubles with the screen brightness control in my laptop and I fixed it by adding the acpi_osi=linux and acpi_backlight=vendorparameters to the filegrub.cfg. I'd like to know what these ...
21
votes
5answers
21k views

How to stop update-grub from scanning all drives?

Every time update-grub is run all hard drives are scanned. Each drives that is in standby state will spin up to go idle. This is a waste of energy. We use update-grub version 1.98: # update-grub -v ...
20
votes
10answers
126k views

How to start a windows partition from the Grub command line

I have Windows 10 HOME installed on my system. After I installed Windows 10 HOME, I installed Ubuntu 14.04 LTS on a separate partition so that I could dual boot. I removed Ubuntu 14.04 LTS by ...
18
votes
5answers
78k views

How do I change the GRUB boot configuration from within Windows?

I currently dual boot Windows 7 and Fedora 14, using GRUB, with Windows 7 as my default. I know that from Fedora, I can set GRUB to boot into Fedora, overriding the default, on the next reboot. Is ...
16
votes
1answer
17k views

GRUB Quiet Splash

As a Linux newbee, I would like to know What exactly is the significance of "Quiet Splash" in GRUB? GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
14
votes
3answers
6k views

Is the entire kernel loaded into memory on boot?

I read through this popular IBM doc (I see it referred quite often on the web) explaining the function of the initial RAM disk. I hit a wall in conceptualizing how this works though. In the doc it ...
14
votes
1answer
11k views

How do multiple boot loaders work on an EFI system partition

My ESP looks like this Boot Dell fedora Microsoft In the Boot directory, their is a boot-loader named bootx64.efi which I understand is the default boot loader that get started first. But in the ...
14
votes
2answers
103k views

Cannot find EFI directory: issue with grub-install

I was trying to rescue GRUB in Linux. I was able to login in the OS following this tutorial: https://www.lisenet.com/2014/grub2-rescue-mode-error-unknown-filesystem/ I have to upgrade GRUB to fix ...
12
votes
3answers
83k views

Mouse and keyboard not working in Ubuntu 14.04

I updated my Ubuntu Linux to 14.04 and now the mouse and keyboard don't work in the login screen. I tried re-installing grub from a Live USB, but it's still not working. I would really appreciate your ...
12
votes
3answers
9k views

Which Bootloader is Used on a Chromebook?

I installed ChrUbuntu on an Acer C7 Chromebook, and I am able to dual boot Ubuntu 12.04 and ChromeOS and to control which OS loads by default. I tried to edit the /etc/default/grub file and did run ...
11
votes
3answers
17k views

How does Linux deal with a separate /boot partition?

I am interested to learn about how Linux deals with a separate boot partitions. I am not interested in actually doing this, but I would like to know how this works under-the-hood. Consider a hard ...
11
votes
2answers
17k views

Rotate console on startup (Debian)

I want to rotate my console (not X Server) by 90 degrees (clockwise). The following seems to work for me: echo 1 > /sys/class/graphics/fbcon/rotate; however, I'd prefer to use a kernel option in ...
10
votes
2answers
31k views

How to change default boot partition?

I installed Antergos on my laptop, then installed Ubuntu after that. Ubuntu detected that I had another Linux installed, so it added Antergos to its grub menu. Every time I boot up, grub is loaded ...
9
votes
1answer
10k views

GRUB_CMDLINE_LINUX_DEFAULT vs GRUB_CMDLINE_LINUX

What is the difference between these two options in /boot/default/grub GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" GRUB_CMDLINE_LINUX=""
9
votes
5answers
11k views

How does Grub Stage1, exactly, access/load stage 2?

This is my first ever question, I have put this question in front of Red Hat Instructors but didn't find any satisfying answers. I'm using RHEL/CENTOS6, GRUB Legacy 0.97, and have consulted heaps of ...
9
votes
2answers
9k views

How to identify root partition via UUID without initramfs/initrd

Without initramfs/initrd support, the following kernel command line won't work: linux /bzImage root=UUID=666c2eee-193d-42db-a490-4c444342bd4e ro How can I identify my root partition via UUID ...
9
votes
1answer
11k views

How does the grub efi loader find the correct grub.cfg and boot directory?

As I understand it, the uefi bios loads grub.efi from the efi partition. This now loads a bunch of grub modules and the configuration file from the /boot directory. But how does grub find the correct ...
8
votes
1answer
27k views

How do I remove the timeout in the boot menu

I installed several operating systems on my computer in a multiboot configuration (Ubuntu, Linux Mint, Windows, ...). When I turn on my PC, the boot menu appears with a timeout. Sometimes, I don't ...
8
votes
2answers
66k views

How to start a windows partition from the Grub command line?

I have Windows 7 installed on my system. After I installed Windows 7, I installed Fedora on a separate partition so that I could dual boot. I removed Fedora by deleting the partition it was installed ...
8
votes
3answers
18k 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 ...
8
votes
4answers
2k views

Grub location - did it go to the mbr or elsewhere?

I have a dual boot setup with linux and Windows 7 with Grub as the bootloader. My partition table looks like this: 100 MB System Reserved Windows 7 500 GB Windows 7 100 MB /boot - ext2 500 GB linux, ...
8
votes
2answers
67k views

grub-install : command not found

I had Windows 8.1 and Kali Linux installed in an extended partition. For some reason, I only formatted the partition where Windows was installed and re-installed. Now it only boot into Windows and ...
8
votes
2answers
64k views

Need to boot Windows 7 from Grub rescue command prompt

I booted my computer today and found the Grub rescue command prompt. I have been given this computer and it has Linux and windows 7 on it, but I have only ever used the windows section. I have no idea ...
8
votes
2answers
9k views

Can I install grub2 on a flash drive to boot both BIOS and UEFI

Well, obviously I can, because all of the Linux distros are delivered as hybrid ISOs that can boot both BIOS and UEFI. The question is how? I had thought I could run grub-install twice: grub-install ...
7
votes
3answers
50k views

Laptop boots directly to Ubuntu, can't access BIOS or Boot menu anymore

I'm running Laptop with single OS: UbuntuMATE 15.04 Beta1 64bit on Toshiba laptop Core i3. After burning "Elementary OS" on a live USB drive using UNetbootin, what happened is: -After reboot, laptop ...
7
votes
2answers
6k views

Grub2 without arrow keys

My laptop keyboard recently had a losing encounter with a beer, and the arrow keys don't work anymore. No big deal, I figured -- I remapped CAPS+hjkl to the arrows in xkb, and after a little getting ...
7
votes
4answers
7k views

hibernate to disk not restoring, but suspend to ram is working

I have Debian 6, I have also seen this under Ubuntu (can not remember how I fixed it). I can hibernate, but when I switch on the system cold boots (it does not restore previous session). Note ...
7
votes
5answers
23k views

not syncing vfs unable to mount root fs on unknown-block(0 0)

I had a windows10 and Manjaro on my laptop and everything was Ok. last day I've installed Kali Linux in another partition. It has installed correctly and it works fine. But the problem is when I want ...
7
votes
2answers
14k views

How do I increase the font size of the CentOS 7 console?

When I booting to CentOS, the character is too small. I tried to config grub2 files following this solution, but it seems not work. My /etc/default/grub file is : So, how can I increase the font ...
7
votes
1answer
4k views

USB Keyboard does not work with Grub

I am setting up Arcade Puppy http://scottjarvis.com/page105.htm on an old Dell GX50 PC. Instead of using a PS2 style keyboard which I don't have I opted for a low profile generic USB keyboard. The ...
7
votes
5answers
20k views

Debian 10 Buster | update-grub | command not found

update-grub failed with an error message # update-grub bash: update-grub: command not found @GAD3R Output of # [ -d /sys/firmware/efi ] && echo EFI || echo legacy legacy Note1 I've ...
7
votes
1answer
9k views

`isolcpus` kernel parameter has no effect on Ubuntu 16.04 desktop

I added the following line to /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=1,3" then ran sudo grub-update (and rebooted) but according to top processes are still being ...
7
votes
1answer
17k views

What is resume= used for in my grub boot settings?

I've always noticed the resume=/dev/foo entry in /boot/grub/menu.lst, and that it corresponds to the swap partition, but I've never questioned its use. title SUSE Linux Enterprise Server 11 SP2 - 3....
7
votes
6answers
65k views

Dual Boot Windows - Linux Mint grub menu not appearing at startup

I have Windows 10 operating system on HP Pavilion laptop not very old. I have installed Linux Mint on another partition and both the operating systems work fine (I am able to use both of them). My ...
7
votes
1answer
5k views

after BIOS splash, will not boot, asked to select OS, but can't

I'm running Linux Mint 13 MATE 64-bit. Everything has been working for several weeks. Yesterday, when I tried to boot up my computer, after the BIOS screen flashes I reach a screen with a black ...
7
votes
1answer
720 views

kexec and USE_GRUB_CONFIG

I find kexec very useful to speed-up the reboot of Linux servers. One parameter into /etc/default/kexec is USE_GRUB_CONFIG. This parameter is meant to "read Grub configuration file". But I don't ...
7
votes
3answers
7k views

Booting a newly compiled Linux kernel

I have started reading the book Essential Linux Device Drivers. I am following the process for compiling and booting into a new kernel. However I am unable to boot into the newly compiled kernel - I ...
6
votes
2answers
12k views

Is it possible to add some 'PXE Network Boot' option to GRUB?

This is an example of my available GRUB menu boot options: 1 menu label ^ 1) Xubuntu 14.04.02 LTS 2 menu label ^ 2) Windows 7, x86 & AMD64 3 menu label ^ 3) Windows 8, ...
6
votes
2answers
716 views

How is the kernel loaded?

I am trying to understand the Linux boot process, and after reading quite some amount of documentation there is one point that I still can't seem to understand. So the basicis is BIOS -> Grub MBR -> ...
6
votes
2answers
8k 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
5k views

Grub fails to install - Debian Wheezy with mdadm RAID1 and GPT partition table

I've been trying all day to get my new Wheezy install completed but it fail to install Grub every time. I'm using x64 netinstall iso. Here is my partition table: Model: ATA ST3000DM001-1CH1 (scsi) ...
6
votes
1answer
758 views

How do I remove the “search” command from grub.cfg properly?

I don't want grub to "search" for anything. I know where my root file system is, and it will always be there (/dev/sda1), and I don't want grub to go looking at all the connected drives to find some ...
6
votes
2answers
20k views

Unable to launch Fedora 18 LiveCD using USB device

I just bought a new motherboard which has BIOS and UEFI. I have a previously working LiveCD installed on my usb, created with LiveUSB Creator. I tried using it to boot but got stuck at the grub ...
6
votes
1answer
3k views

Getting an existing Linux installation from one computer to boot on another

I have an existing Dell Precision 690 workstation setup to dual boot Windows XP and CentOS 5.5. These operating systems are installed on two separate drives. I have a grub menu on the Linux drive with ...
6
votes
1answer
3k views

How to make GRUB resume from hibernate in a dual boot PC

I have a laptop running two different GNU/Linux-based operating systems. Each operating system has it's dedicated root and home partition, but share the boot and swap partition. They both work quite ...

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