Questions tagged [grub]

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

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43
votes
7answers
128k 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 ...
36
votes
6answers
99k 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 ...
31
votes
2answers
39k 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 ...
30
votes
2answers
246k 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 ...
23
votes
2answers
39k 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 ...
18
votes
5answers
18k 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 ...
17
votes
2answers
33k 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 ...
17
votes
4answers
72k 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 ...
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
15k 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"
13
votes
9answers
92k 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 ...
13
votes
1answer
8k 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 ...
12
votes
3answers
8k 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
16k 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
15k 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
3answers
73k 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 ...
9
votes
2answers
25k 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 ...
8
votes
1answer
25k 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
65k 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
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
66k views

Cannot find efi directory: issue with grub-install

I was facing grub rescue issue in linux. However i was able to login in the OS with below tutorial https://www.lisenet.com/2014/grub2-rescue-mode-error-unknown-filesystem/. I have to upgrade grub to ...
8
votes
1answer
8k 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
2answers
63k 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 ...
7
votes
3answers
35k 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
5k 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
3answers
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
3answers
12k 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 ...
7
votes
3answers
10k 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 ...
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
2answers
58k 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 ...
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
629 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
10k 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 ...
6
votes
2answers
10k 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
645 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
4k 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
575 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
5answers
50k 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 ...
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
2k 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 ...
6
votes
3answers
3k views

Getting “NTFS5: No ang0” error message when booting Linux Mint

I am getting the following message as shown in the link below when trying to boot into linux mint 13. Try (hd0,0): NFTS5: No ang0 Try (hd0,1): NTFS5: No ang0 Try (hd0,2): NTFS5: No ang0 Try (hd0,3): ...
5
votes
2answers
297 views

Ignorantly dd'd /dev/sda*

I was trying to write an iso to a flash drive. I mistakenly thought that all /dev/sda* are flash drives attached to the system. I wasn't sure how to figure out which was which, so I just unplugged my ...
5
votes
1answer
631 views

Win10/Ubuntu dual-boot - Locked out of grub

So, I've managed to get Windows 10 and Ubuntu 14.04 LTS dual booting -- I have grub set to come up for a few seconds on boot so I don't have to mash F12 when I want to boot to Linux (windows is the ...
5
votes
2answers
424 views

Can we use Linux Mint ISO to repair Ubuntu's Grub?

A friend of mine is running Ubuntu and got GRUB RESCUE. Can they use Mint ISO to repair their Grub? As I don't have Ubuntu ISO?
5
votes
2answers
7k 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 ...
5
votes
1answer
8k 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 ...
5
votes
2answers
739 views

Boot process stops until PS/2 key presses?

I'm working on an embedded product based on Gentoo linux 3.6.6 running on a Mini-ITX motherboard. We're looking at switching motherboards (from a Jetway NF9D-2550 to an Advantech EIMB-214), and to ...
5
votes
1answer
2k views

Grub modify menu screen [ advanced ]

I've modified my Grub menu. Here is how it looks like right now: What I would like is to remove the top information about Grub version or even better to remove all "GNU GRUB version 1.99-27....