GRUB2 is the next generation of the GRand Unified Bootloader (GRUB). Ubuntu has used GRUB2 as the boot loader since 9.10 (Karmic Koala). Commonly referred to as simply "GRUB".

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81
votes
9answers
100k views

How can I repair grub? (How to get Ubuntu back after installing Windows?)

I installed Windows 7, which ate Ubuntu's boot file. When starting up the computer, it now goes straight to Windows, without giving me the option of booting Ubuntu. How can I get Ubuntu back?
148
votes
28answers
132k views

How do I remove or hide old kernel versions to clean up the boot menu or free space?

Every time I install a new Linux kernel, it gets left in the grub config, making the boot menu longer each time. I know I can manually search through the installed packages and remove them. Does ...
70
votes
16answers
147k views

How do I set Windows to boot as the default in the boot loader?

How do I set the bootloader so that in my dualboot with Windows 7/Ubuntu 11.04, Windows start up as standard instead of Ubuntu?
111
votes
5answers
396k views

How do I change the GRUB boot order?

I have both Windows 7 and Ubuntu installed on a shared machine. Because a lot of the non-developers use Windows, I'd like to change the boot order to make it easier for them. Currently the boot order ...
17
votes
2answers
58k views

How do I set 'nomodeset' after I've already installed Ubuntu?

I know that editing the boot options line and adding 'nomodeset' solves my laptops problem during LiveCD mode, what I don't know is how to set it at boot up through Grub2 after I've installed Ubuntu. ...
13
votes
4answers
79k views

Grub rescue - error: unknown filesystem

I have a multiboot system set up. The system has three drives. Multiboot is configured with Windows XP, Windows 7, and Ubuntu - all on the first drive. I had a lot of unpartitioned space left on the ...
13
votes
5answers
47k views

How do I reset a lost password (using recovery mode requires me to type the password)?

I need to reset my password. I have followed these steps: How do I reset a lost Administrative (root) password? However, then I go to "root" or "netroot" recovery options, it tells me: Give root ...
24
votes
3answers
26k views

How do I add a kernel boot parameter?

I need to add the boot parameter foo=bar to my kernel. How can I do this once for testing, and permanently if testing was a success?
18
votes
2answers
23k views

How do I boot into a root shell?

When booting to the graphical desktop fails we sometimes are recommended to boot into a "root shell" or to boot in "recovery mode". How do I do that?
13
votes
6answers
200k views

Fixing GRUB error: “error: unknown filesystem”

When booting into Ubuntu, I'm getting the following error with a grub rescue shell following it: Error: unknown filesystem. grub rescue> I'm not exactly sure what I did. I believe I installed ...
18
votes
5answers
4k views

How do I investigate boot and partition issues?

My machine won't boot, or won't choose the right operating system when I choose it in the grub menu, what information do I need to provide in my questions so people can help me?
14
votes
6answers
73k views

How to install Windows 7 after Ubuntu and dual boot? [duplicate]

I just installed Ubuntu, a full install removing the prior OS. I was forced to remove Windows 7 from my HP dv6 because of the max four partitions already being there. I didn't lose anything, all ...
32
votes
1answer
38k views

Dual boot Surface Pro with Ubuntu?

How could I setup a dual boot for Ubuntu and Windows 8 on my Microsoft Surface Pro with 128 GB. Note: My dual boot solution is below.
37
votes
2answers
105k views

How do I set the grub timeout and the grub default boot entry?

Hello I'm newbie 2 ubuntu 12.04 How do I set the grub time and default os(that I see at the boot time) as I'm using dual boot OS(Windows 7 and Ubuntu 12.04)
4
votes
1answer
6k views

Windows 7 doesn't boot after Ubuntu install

I had windows 7 installed on my pc, then I installed Ubuntu 10.10/ During the installation process I have chosen to manually set my partitions: I set a 10GB drive for ubuntu root 1GB drive for swap ...
5
votes
3answers
15k views

frequency out of range - please change display mode

I just downloaded the latest version of the Ubuntu live CD, and have installed it on a desktop computer (a Fujitsu Scaleo P). Once installed it seems to work perfectly, although there are some updates ...
3
votes
4answers
15k views

Error out of disk, grub rescue

I installed Ubuntu via usb with no problems, but when I restart, I get an error message: "error out of disk" 'grub rescue." How can I fix this?
2
votes
2answers
2k views

Why does my screen blank out for the duration of the Grub boot menu?

Upon booting, when I should see the GRUB menu, my monitor simply says: "No optimum mode. Recommended mode: 1600*1200". If I wait for a short while, Ubuntu starts to boot and it reaches the desktop. ...
25
votes
6answers
85k views

Recovering GRUB after installing Windows 7? [duplicate]

Possible Duplicate: How can I repair GRUB? (How to get Ubuntu back after installing Windows?) I installed Windows 7 after it crashed, and now I am unable to boot Ubuntu. Ubuntu ...
14
votes
3answers
64k views

How do I boot into single-user mode from GRUB?

After changing a few lines in xorg.conf, I can no longer boot Ubuntu (I assume it breaks when trying to load up X), so I need a way to boot into a single-user mode. However, there seems to be zero ...
12
votes
4answers
39k views

How can I boot with an older kernel version?

The latest kernel is causing problems with my sound, which worked fine with an older version. As I have only Ubuntu installed, Grub is not getting displayed while booting. How can I manually choose my ...
3
votes
2answers
300 views

I need my pendrive to boot into Ubuntu, how to correct this and boot from the HDD?

I installed Ubuntu through USB. Instillation was successful. But when I restarted my laptop it didn't boot. So planed install it again when started selected install from USB. it booted my previous ...
4
votes
2answers
3k views

Accidently installed grub to usb

While doing a fresh ubuntu install (dual boot with XP using resize), I somehow managed to install grub to the source usb instead of to the harddrive. Normal harddrive boot goes straight to XP. Booting ...
2
votes
2answers
7k views

After installing Ubuntu from USB, GRUB2 can't be installed!

Hello ladies and gentlemen! I installed Ubuntu alongside with Windows 7 using live USB. It wouldn't let me install GRUB, it says there's a fatal error with the partition chose. I literally chose ...
10
votes
1answer
51k views

How do I boot into recovery mode?

I recently tried booting into the Grub2's menu entry "Ubuntu GNU/Linux, with Linux 3.2.0-24-generic-pae (Recovery Mode) just to see what was there. It booted successfully, but I had no idea what to ...
5
votes
2answers
9k views

Grub rescue problem after installing ubuntu

I have windows 7 installed in my internal hdd and wanted to try out Ubuntu so I got a USB to put Ubuntu LiveUSB on and installed Ubuntu on an external HDD and everything worked out fine. Now the ...
14
votes
4answers
6k views

How do I install BURG?

I found the source in launchpad for 11.04 and 10.10 but I don't know how to install or compile it.
8
votes
2answers
17k views

How do I resolve a GRUB: “invalid arch independent ELF magic” error?

I am stuck with a rather irritating problem I ran into after installing 11.10 on my macbook pro 5,5. I did a clean install efi booting into the setup using the desktop cd. Upon the first reboot I was ...
1
vote
1answer
3k views

Can't boot XP after Ubuntu Installation, how to fix?

I installed Ubuntu and after the installation, i can't boot to XP. When i choose XP from the Grub menu, I got black screen for like 30 sec, and then it returns to the Grub menu. Thanks!
22
votes
5answers
281k views

Recovering from 'grub rescue>' crash

I did a dumb thing... I forgot that Ubuntu 10.04 (Lucid) switched to Grub2 which puts a ton of *.mod files (kernel modules) in /boot/grub. I thought they were soundtrack files put there erroneously ...
12
votes
7answers
33k views

Grub does not show a Windows 8 option after dual boot

So, I've successfully dual-booted my Windows 8 machine with Ubuntu 12.04 . However, I still don't have a convenient method of choosing what OS to load at boot time. After installing Ubuntu, my ...
10
votes
2answers
38k views

How do I safely change grub2 screen resolution?

I did a fresh install of Ubuntu 11.04 on a HP 550 Notebook. But grub2 isn't really fit in the best screen resolution that this Notebook can support (1280x800). How can I do this without using a ...
8
votes
5answers
16k views

Sony VAIO with Insyde H2O EFI bios will not boot into GRUB EFI

I bought a new Sony Vaio S series laptop. It uses Insyde H2O BIOS EFI, and trying to install Linux on it is driving me crazy. root@kubuntu:~# parted /dev/sda print Model: ATA Hitachi HTS72756 (scsi) ...
5
votes
4answers
18k views

Stuck on GRUB Command Line

I am running Natty Alpha 3. I used Update Manager to install something (not sure what it was), then I restarted, but instead of listing all the kernels, it gave me a command line. I don't know what ...
16
votes
1answer
30k views

GRUB complains of “no such partition” after installing 12:04

I have just installed 12.04. I previously had 11.10 installed, with /dev/sda6 as the install partition mounted at / and with /dev/sda1 mounted at /home. When installing 12.04, I duly selected the ...
22
votes
5answers
5k views

Decrease GRUB timeout

The GRUB timeout is 8 seconds. Can this be turned down to 2 or 3 seconds? What is the best way to do this?
11
votes
2answers
21k views

GRUB: “invalid arch independent ELF magic” after install on SSD [duplicate]

I've got a brand new laptop with a 128GB SSD drive. I read that aligning the partitions to match the Erase Block Size of the SSD is important. I followed William Scott's guide SSD Tweaks in Linux and ...
6
votes
3answers
4k views

Ubuntu does not put Fedora into GRUB menu

I have installed a number of operating systems, including Fedora. Most recently I installed Ubuntu, and Ubuntu installed its own version of the GRUB bootloader. However, Fedora does not show up on the ...
9
votes
3answers
60k views

Boot error > no such device: grub rescue [duplicate]

After an installation of Ubuntu 12.04, erasing an old partition with Ubuntu 10.10, I can't get grub to load. I can't access my Windows 7 partition either I get the message: > error: no such ...
3
votes
3answers
4k views

Windows 8 installed Ubuntu 12.10 boots straight to Windows 8

I installed Ubuntu 12.10 on my new Windows 8 Dell Inspirin and would like to set up a Dual Boot. However, when I restarted, it just went straight to Windows 8 without giving me a Grub screen with ...
13
votes
5answers
15k views

How can I get some nice eye candy themes for Grub?

Grub is well Grub. How do I pimp it a bit with some nice themes?
14
votes
5answers
1k views

Is it safe to delete the old kernels from menu.lst?

When the computer starts, GRUB shows a long list of previous kernels in addition to the usual stuff, e.g. Ubuntu 10.10, kernel 2.6.35-23-generic Ubuntu 10.10, kernel 2.6.35-23-generic (recovery mode) ...
5
votes
5answers
20k views

No Grub after installing Ubuntu beside Windows 7 [duplicate]

Possible Duplicate: How can I repair grub? (How to get Ubuntu back after installing Windows?) I am trying to dual boot Ubuntu 10.10 alongside Windows 7, after install I receive no Grub menu ...
8
votes
3answers
35k views

How can I add an entry for Ubuntu to the Windows 7 boot menu?

I have the following setup: first partition is windows 7 partition second partition - ubuntu 12.04 partition while installing ubuntu I installed grub2 bootloader to ubuntu partition mbr contains ...
7
votes
2answers
9k views

Purple start screen - no splash screen

After installing Ubuntu 11.10 on a new computer everything worked fine for a few weeks and now suddenly when starting up Ubuntu I get a blank purple screen with no "Ubuntu" splash and the 5 dots but ...
8
votes
3answers
18k views

“invalid EFI file path” while booting Windows [closed]

I just got my new working notebook with Windows 8 pre-installed. After installing Ubuntu 12.10 the grub menu says that there is an "invalid EFI file path" and it won't boot Windows. Ubuntu works ...
5
votes
1answer
10k views

Hide Grub menu and keystroke to reveal

How do you have the grub appear on a key combination, but have windows boot default. I'm running ubuntu 11.10 and grub 2.0. Here is my current /etc/default/grub # If you change this file, run ...
4
votes
2answers
28k views

Fix grub2 after installing ubuntu 12.04

I've installed ubuntu 12.04, but after rebooting I get the message: GRUB loading: Welcome to GRUB! error: file '/grub/i386-pc/normal.mod' not found Entering rescue mode... grub rescue> I have ...
1
vote
2answers
505 views

How do I set up multiple HDD?

I got some new hard discs and would like to set my PC up in the following way: Ubuntu is currently installed on one drive I want to put Windows on a second drive I would like a third drive for ...
1
vote
2answers
2k views

Ubuntu boots to grub rescue

I have two systems installed previously Windows 7 and Ubuntu. I was trying to reinstall Ubuntu and format the Ubuntu OS partition using a tool in Windows 7. When I have Ubuntu ready on a USB stick ...