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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How to fix plymouth (splash screen) in all Ubuntu releases!

How to fix black or broken plymouth (splash screen) after installation of nvidia proprietary drivers in Ubuntu (it happens usually in all Ubuntu releases)? It's no matter what version of nvidia ...
17
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1answer
21k views

Which commands to convert a Ubuntu BIOS install to EFI/UEFI without boot-repair on single boot hardware?

Accidental BIOS mode install I have Intel 64-bit hardware with UEFI setup utility. Ubuntu 14.04.1 LTS was installed as the only operating system on the only drive attached. Accidentally Ubuntu was ...
10
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5answers
55k views

How to restore Windows 7 MBR without a CD

I have been playing with Ubuntu for a few weeks now, and I'd like to revert my computer back to it's original - factory - defaults. On the computer I have a recovery partition (it's a netbook). I ...
15
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2answers
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Editing the default boot item in grub menu, a definitive answer?

Each time I've tried to dual boot Ubuntu with Windows I always have difficulty with the same thing... editing the default option on the grub boot loader. I'm now running 11.10 and have run into the ...
2
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2answers
8k views

Cannot Restore Grub After Windows 8.1 Upgrade

I have an Ubuntu 13.10 and Windows 8 dual-boot working properly, and upgrading to Windows 8.1 breaks grub2 as expected. However, this time boot-repair was not able to bring grub back for me. My laptop ...
4
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1answer
10k views

Windows 8 deletes GRUB when booting

I have this situation: SONY VAIO SVF1521V1EB Windows 8 preinstalled in UEFI. I decided to install Ubuntu 13.10 in dual boot. So I downloaded the amd64 iso, burnt on a DVD, then booted from DVD in ...
4
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1answer
1k views

How to prevent Ubuntu from overwriting grub bootloader after update?

Is there any way I can stop Ubuntu from overwriting bootloader? It happens after updating (I suppose) system's kernel. I want to stay with my other linux distro bootloader without having to change ...
28
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4answers
92k 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 ...
9
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3answers
38k views

GRUB does not detect Windows

I have finally installed Ubuntu on my second drive. When I start my computer GRUB only offers me to boot Ubuntu, not Windows 7. What needs to be done so that I can choose between Ubuntu and Windows in ...
18
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6answers
120k views

How can I edit my Grub bootloader entries (Hide, Rename, Remove)? Preferably doing it manually, and not with a program

So basically I have a pretty flooded Grub bootloader, with older linux versions, 3 operating systems and memtests. What I want is to leave the operating systems only. I need to know how to do it ...
9
votes
2answers
30k 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 ...
10
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2answers
27k views

ALERT! /dev/disk/by-uuid/xxxxxxxxx does not exist. Dropping to a shell

I am using Ubuntu 14.04. On 23 August 2014 I ran in terminal sudo apt-get update. Then I rebooted the system. And now I see: ALERT! /dev/disk/by-uuid/xxxxxxxxx does not exist. Dropping to a shell ...
0
votes
1answer
851 views

'Upgraded' to Windows 10 on dual boot, and can't boot to Ubuntu partition

I recently updated my windows 7 to 10, and destroyed grub in the process. I ran Boot-Repair on a live CD and managed to get the Windows Partition back. However grub still doesn't come up for me. The ...
20
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7answers
21k views

How to reboot into Windows from Ubuntu?

I'm looking for a way to reboot into Windows from Ubuntu on a 10.10/Vista dual boot system. The specific use case is that I would like to be able to ssh into my running Ubuntu instance and issue a ...
27
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2answers
22k views

How can I force Ubuntu to boot on a stuck boot menu?

I have Ubuntu Server 11.04, but it is headless (no monitor). The only way I want to be able to access it is remotely via SSH. But, sometimes, say after a power loss, when the server restarts, it will ...
30
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5answers
10k 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?
13
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2answers
1k views

One click shutdown Ubuntu and load into alternative bootup

I have a dual boot system with Ubuntu 11.04 and Windows 7. My GRUB bootloader defaults to Ubuntu. I mainly use Ubuntu, but I occasionally need to bootup Windows to do a few things. If I need to do ...
10
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3answers
80k 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 ...
8
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2answers
9k views

Using a bootable live cd disk image mounted on the hard drive

I want to mount the contents of a boot-able CD image, like Ubuntu rescue remix, to a partition of the hard drive. So I can have an entry in Grub to boot to the contents of that disk, http://www....
5
votes
4answers
31k views

Uninstalling GRUB from UEFI laptop

I installed Ubuntu alongside Windows 8, however have decided to unisntall Ubuntu. First I booted into Parted Magic and, using GParted deleted all the ext4 and swap partitions. This leaves me with ...
7
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1answer
4k views

GRUB2 shows Windows 7 or Windows Recovery Environment instead of Windows 10

This is a Q&A that I recently have figured out, so I have posted the answer below. After installing Windows 10, every time I get a kernel update or I run the update-grub2 it always shows Windows ...
8
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3answers
7k 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 ...
5
votes
2answers
5k 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. ...
3
votes
4answers
6k 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 ...
80
votes
2answers
75k views

Diskfilter writes are not supported > What triggers this error?

This message occurs when leaving the Grub menu and before the Ubuntu splash screen. How do I fix the problem to clear the message? And what doe is it mean? error: Diskfilter writes are not ...
42
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5answers
93k views

How can I show or hide boot messages when Ubuntu starts?

Is there a way to easily turn on/off showing the boot messages (loading the services) when Ubuntu starts? Is it something in Grub2? I am running Lucid.
21
votes
6answers
56k views

How to boot from non-Ubuntu live ISO images like Fedora or CentOS?

I found that it can be done with loopback as follows menuentry "Lucid ISO" { loopback loop (hd0,1)/boot/iso/ubuntu-10.04-desktop-i386.iso linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=/...
23
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10answers
56k views

Hide GRUB2 menu UNLESS you hold down Shift key: how to make this happen?

I have a Ubuntu - Windows 7 dual-boot set-up, and I would like to have it that my laptop would boot up Windows 7 unless I press down the Shift key right after boot and bring up the Grub2 menu from ...
18
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6answers
81k views

After update, get “error: file not found.” followed by “grub rescue> _”

I just installed quite a lot of 12.10 updates, was prompted to reboot, and then found that I couldn't boot.
21
votes
1answer
111k views

Cannot update grub with paramters on live USB

I have booted from a live USB ("Try Ubuntu"), that also has a persistent option set (I used LiLi to create one) to do some tests for this pcie hotplug issue I'm having. I'm trying to test some boot ...
18
votes
5answers
266k views

Grub rescue prompt, repair grub [duplicate]

I recently repartitioned my hdd and I have damaged grub on my system. On boot I get the grub rescue prompt and I have to go through the following steps in order to boot normally: set root=(hd0,msdos6)...
6
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4answers
22k views

Unable to install Ubuntu on Lenovo Y500

I am totally unable to install any flavor of Linux on my lenovo Y500. TL;DR: with EFI on -> cannot even access installer with legacy - > installer runs fine, but installed OS never boots Long ...
6
votes
1answer
12k 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 '...
15
votes
4answers
29k views

How can I add the Memtest86+ options back to the Grub menu?

After having installed the 64bit version of Ubuntu 12.04 on my Lenovo B570 I ran into the same problems I had when installing 11.10 with Grub not playing nicely with a uEFI system. I used the same ...
9
votes
2answers
34k views

Booting Ubuntu Failure : error: attempt to read or write outside of disk 'hd0'

I have installed Ubuntu 12.10 in a Western Digital external hard drive (320GB). This is a complete installation, not a live USB. When I plug it in my HP desktop I go to the BIOS settings and boot off ...
4
votes
2answers
905 views

Dual boot ubuntu 11.04 and fedora 15

I want make dual boot with feodra 15 and ubuntu 11.04 for testing features,please guide me the same. i had done dual boot with windows and linux but not linux linux.
11
votes
2answers
29k 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 ...
4
votes
2answers
697 views

How to password protect Grub menu

How to password protect Grub menu from the ro recovery nomodeset command. I want it to where no one unless you have the password to make changes to the menu to try to get into recovery.grub
2
votes
2answers
14k views

UEFI bootloader alternative to GRUB

I'm having trouble with my current bootloader GRUB on Ubuntu 12.04. Sometimes it takes forever too boot, other times it wont find the kernel image. My system uses UEFI to boot, is there a UEFI ...
10
votes
5answers
126k views

How to boot into Windows 7 when grub is installed in the Windows partition?

Original title: How can i solve (un)booting windows 7 on the same partition with grub? I've been researching for 2/3 days about this problem and I have came up empty. Basically, partition 1 is ...
19
votes
2answers
6k views

How can I see what happens during the boot process?

On my machine booting takes more than a minute which is annoying when I see that Windows 7 boots in 20 seconds. Here is what I get when the machine is booting. How can I see what happens when ...
16
votes
6answers
26k views

How do I get my blacked out ttys back? [closed]

Original Question: After I replaced my Ubuntu 10.10 with 11.04 all I get when I Ctrl+Alt+F1–F6 into a tty is a black screen. Also when I boot there's a while of black screen after grub2 menu is ...
13
votes
0answers
21k views

How do I boot into console mode? [duplicate]

In previous versions of Ubuntu I could get the computer to boot into console mode by setting the variable GRUB_CMDLINE_LINUX_DEFAULT to "text" in the file /etc/default/grub and run sudo update-grub. ...
6
votes
5answers
28k 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 ...
27
votes
4answers
132k views

Failed to get canonical path of /cow

I am trying to install Ubuntu 12.10 for quite some time, and passing hurdles one by one. Now I am in a situation as follows. I have got a PC and 10 GB HDD which will be totally dedicated to Ubuntu so ...
15
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5answers
2k views

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

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) ...
10
votes
2answers
204k views

How do I edit GRUB menu [duplicate]

I have a dual boot on my computer of Windows 7 and Xubuntu 12.10. The Linux boot is 1st and the Windows 2nd. I would like to reverse the boot order in the GRUB menu. I need to know the steps to go ...
13
votes
10answers
64k views

“Unable to install GRUB in /dev/sda” when installing GRUB

I recently bought a shiny new Lenovo Yoga 2 Pro and I want to dual boot it with Ubuntu for studying purposes. Its built-in OS is Windows 8.1 and it has a 256GB SSD. I've made a separate 90GB ...
0
votes
11answers
50k views

Error 1962: no operating system found after installing 12.04 (Lenovo ThinkCentre)

I just installed a fresh copy of 12.04 on a new Lenovo ThinkCentere from a USB drive, and when I restarted after installation, the boot sequence didn't find the OS. Instead I got the 'no operating ...
6
votes
3answers
15k views

Mac OS X won't boot from grub menu in Ubuntu Precise on Apple MBA(5,2)

I have set up Ubuntu Precise on the new 2012 edition of the Apple MBA(5,2) following the excellent guide over here. Now I want to uninstall rEFIt, in order to avoid going over the boot options twice. ...