Ubuntu :: Reinstalling Ubuntu Grub Bootloader
Jul 13, 2011
Guys i have dual boot. and now i want to reinstall the windows xp. and there is a problem. if i install the windows, widows will wipes out the entire disk and hide the ubuntu. then definatly i may need to reinstall again ubuntu grub boot loader.How can i do this via Live CD?is this right way?and what is my first hard drive? i cant figure out where i install grub? ya its very noob question. but i only know i install grub on /dev/sda6 and in the tutorial i cant understand hd0, 0 what is it?
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Oct 12, 2014
I have a dual boot machine (Windows 7 and Debian). W7 and debian are on the same HD but on different partitions. The debian partition is an LVM encrypted one.
The W7 needs reinstalling, and as I understand the process will overwrite the debian bootloader (grub).
Question: Is there a way to save the current bootloader and recover it after I've reinstalled W7, so I wont have to reinstall debian from scratch?.
I plan to re-install W7 on the same partition it is now, without overwriting the debian partition.
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Jan 11, 2010
I had 9.04, then upgraded to 9.10. After screwing it up, it won't boot. Is it possible to just reinstall Ubuntu using the CD? Cause then I would get GRUB 2. I installed kde-desktop, then it failed to boot (I selected KDM) and that somehow screwed it up.
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Apr 23, 2010
I wasn't thinking at the time, but after I installed Ubuntu 9.10, I installed Xp. Did it the wrong way around, is there anyway to get grub going again, without reinstalling Ubuntu?
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Mar 19, 2011
I had Ubuntu 10.10 installed on an HP G72 laptop, and I wish to reinstall Win 7. I loaded from the recovery disks that I made before installing Ubuntu and all went fine. At the end, I need to restart. When restarting, I am getting the GRUB rescue prompt with "unknown filesystem." It surprises me that GRUB is still there. How can I get rid of it so I can boot windows?
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Apr 18, 2010
I recently had to reinstall Windows XP and as usual it destroyed my grub setup. I have done this before, so I simply booted from a live CD and typed this in the terminal:
Code:
sudo grub
> root (hd0,2)
> setup(hd0)
> quit
Now, the problem with it this time is that in the past in these situations I had only Ubuntu Feisty and Windows XP installed on my machine. But I have installed Ubuntu 9.04 on a separate partition (retaining the old 7.04 installation separately) since I last had to reinstall XP. Doing the above procedure restores my grub sttings to my pre-9.04 installation (i.e. I only get Ubuntu 7.04 and Windows XP in the grub menu).
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Dec 13, 2010
Every other guide I've seen is confusing the heck outta me.
I had ubuntu, and no other OS, then I installed win7, and now I want GRUB to be my MBR.
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Feb 21, 2011
I have triple boot machine Windows 7 + Ubuntu + Mac OS X in a single HDD.
Windows 7 -- /dev/sda1
Ubuntu 10.10 -- /dev/sda2 (In same Partition grub 2.0)
Mac Snow Leopard -- /dev/sda3
I have installed GRUB 2.0 in same partition where current ubuntu is installed ie /dev/sda2 and basically Windwos Boot manager is installed within MBR.. & I have added GRUB 2.0 and Mac OSX entry into windows boot manger with some freeware from windows 7. So practically when I start my computer First Windows Boot manager comes up and asks me which OS to start first. I set up this type of installation with the thought that when grub 2.0 is not installed within MBR, I can format the whole /dev/sda2 partition without any difficulty and reinstalled any future release distro of ubuntu. So is it practically possible? If I format /dev/sda2 and reinstall new ubuntu release there.. Old grub won't affect the installation of new one.
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Jan 15, 2011
I previously had a single 160gb drive with two partitions, dual booted for Ubuntu and XP. I then installed a new SSD drive and put Windows 7 on it and of course I lost grub on the MBR. I have gone through this before so I went ahead and booted the livd CD, installed grub then ran
root (hd0,1)
setup (hd0)
but then got these errors;
Error 22: No such partition
grub> setup (hd0)
setup (hd0)
Checking if "/boot/grub/stage1" exists... yes
Checking if "/boot/grub/stage2" exists... yes
[Code]....
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Apr 8, 2010
My set up is internal hard drive Windows 7, external Ubuntu Karmic. The reason I have it this way, despite Linux being my main OS, is because my internal hard drive is 6 years old and half the capacity of my external new one. Have tried quite a few set ups with various Linux platforms, but have finally settled on above. As yet, I don't know Linux or Ubuntu all that well. Getting somewhere, but it's a steep learning curve.
Because of constant errors reinstalling WinXP - umpteen installations and it keeps crashing - the problems are with security updates and SP3 - I finally bit the bullet and intalled Win 7. I only need Windows for a few essential programs or I'd happily never look at it again, so it filled me with horror doing this, but I couldn't take the crashes any more. So, today, Win 7 installs just nicely. However, I can no longer boot my external Ubuntu hard drive. The error is, 'Grub loading stage 1.5... Grub loading please wait... Error 15'. I load up the live cd, but when I try to follow instructions given to other people with Error 15 (editing files, accessing root) I don't have permissions.
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Apr 25, 2010
I have 2 hard drives, 1 with Windows 7, and one with Ubuntu.
Before installing Ubuntu I had PCLinuxOS then I got a book on learning Linux that is Ubuntu specific so I formatted it and installed Ubuntu 9.
My problem is:
When I boot up I get a WINDOWS bootloader first that lists:
Windows 7
Ubuntu
Then when I click Ubuntu I get the GRUB bootloader.
I've tried reinstalling Grub. I've also tried SuperGrub but none of the options worked, most returned error 15.
So I want ONLY GRUB to show up when booting. From there I think I can edit the grub file to set a timeout of 3-5 seconds, with Windows 7 as DEFAULT boot (Do I need to type "setactive" under my Windows 7 entry to do this part?)
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Aug 5, 2011
I installed Fedora 15 alongside Ubuntu, only to discover that it doesn't play nice with Ubuntu and this means that even though I formatted the Fedora Partition and made it into a new one, (i needed around a 7gb space for video editing files etc, so it is optimised for this). Anyway, that's off topic. Even though all traces of Fedora are gone, everyone time I go to boot from the HardDrive, it goes into Fedora's starting screen (the blue one with the loading icon) and then says it failed and gives a little command line.
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Nov 7, 2010
I have a major problem installing opensuse 11.3 on my computer( hp pavilion dv6).I downloaded openSUSE-11.3-GNOME-LiveCD-x86_64 from software.opensuse.org: Download openSUSE 11.3 and made a live usb.I'm a newbie at using linux infact i never used another operating system beside windows.Now i have installed windows 7 (on c disk 100gb).My first problem when i am trying to install opensuse is that he dosn't automatic choose to make my partitions so i have to do it manualy.I was searching how to make it the best way so i desited to make 4 partitons one for ' /boot' one for ' / 'one for '/home' and a swap partition/In windows7 i made 4 new partitons
3:10 gb for /boot
4:10 gb for/
5:70 gb for /user
6:10 gb for /swap
My first question is :Is this right to make 4 paritions in windows (opensuse can't format or resize my partitions it just can edit it ) so it's my only way to make partitions( If this is wrong how can i make partitions then)
My second question is how to change the bootloader configurtation because everytime when ii try to install opensuse it stops at about 96% and it says to reconfigure the bootloader options.
If i skip this i get the folowing message
=== System Checking ===
Checking for /usr/bin/chroot binary... Passed
Checking for chroot directory /mnt... Passed
Checking for chroot directory content (bin
boot
Checking for binary /mnt/bin/ls... Passed
Trying to chroot... Failed
This is worth reporting a bug at url.
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Mar 27, 2010
I'm using the Live CD and have followed steps to recover grub2 after XP install. (damn Windows)!
Upon rebooting I get the grub> prompt with no where to go. Upon installing grub via the Live CD I get this:
Quote:
Update:
When I do this link, upon doing the
Quote:
I get this:
Quote:
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Feb 19, 2015
I have a virtual Linux server and i deleted his boot partition by mistake. Now When i try to enter the machine I see
Code:
Select allfilesystem unknown
Grub rescue >
I was told i need to reinstall the server so I've downloaded the ISO files i need.
I've connected the ISO to the machine but i don't know what yo do next.
I've read online that i need to do ls and find where the ISO is so i can boot from it.
But i get error unknown filesystem for everything so i don't know what to do?
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Aug 4, 2010
My Windows installation had a problem and I had to reinstall Windows. The problem now is that I need to get grub back so that I can boot into Fedora. I'm using a Fedora 11 LiveCD I had sitting around. Here are the results of the command most of the way down the first page:
Quote:
Disk /dev/sda: 250.0 GB, 250059350016 bytes
240 heads, 63 sectors/track, 32301 cylinders
Units = cylinders of 15120 * 512 = 7741440 bytes
Disk identifier: 0x000f09ab
[Code].....
I'm tempted to try the grub-install command quoted near the end of the thread, but I don't want to do anything that will hose the system.
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Nov 5, 2009
I have 2 drives, the first has Slackware 13.0 and FreeBSD 7.2. The second has Windows 7. Lilo configured to boot all three, no issues. Perfect. The first drive has 100GB of free space after FreeBSD and today I decided to install Open Solaris on that free space. The install failed, as in Solaris displayed such a message. I did read the Solaris install docs, etc. And it did mention no to install unless it preceded any Linux Swap partitions. There are, I did, but that's not my issue now.
After rebooting, it amazingly loaded FreeBSD by default. No Slackware. So I booted the slackware DVD, ran fdisk and made Slackware the default boot partition, yada yada. Now when it rebooted it gave a little message down in the left hand corner of the screen like "RRG B" highlighted in a red box. Now pressing enter will cause Windows 7 to boot from the second disk. I mounted the slackware partition from the DVD and am there now. Will just running lilo again put everything back to normal? Apparently Solaris left behind a piece of that ill behaved GRUB! (No flames!!!) :-) How do I make it go away?
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Aug 9, 2009
I recently installed Fedora on a triple boot system with Winows XP and Ubuntu JJ. how to add Ubuntu's grub to the bootloader. Here is the output of Fdisk -l.
[root@localhost rabbit]# fdisk -l
Disk /dev/sda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
[Code]....
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Jan 20, 2010
In regards to other distribution cds: I'd like to learn how to install a 'root' and 'grub' boot loader so that I can cleanly install other distributions. I'm new to the file system. Could I make a bootable usb with simple installers? or command line codes?
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Jul 8, 2010
Since I've been using Ubuntu, I've noticed that new entries for Ubuntu (the same but with the final number changed) occasionally appear in the Grub 2 boot loader. I'm talking about the first two entries in this picture, compared with the third and fourth entries here:Two questions:1. What are these entries? They appear to simply be the same OS but different versions. Are they generated when Ubuntu updates?
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Sep 4, 2010
i had a dual boot xp/ubuntu first. later i had to format and reinstall xp. this deleted the grub bootloaderplease let me know, how to fix this! please make it simple . i have the live cd, but i don't have internet connectivity in ubuntu.
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Sep 1, 2011
I installed Ubuntu and Windows 7 on my computer. I first get the Windows bootloader telling me choose between Windows or Ubuntu. If I pick Ubuntu, I then get a GRUB loader telling me to choose between different versions of Ubuntu and Windows 7. How do I remove GRUB and just use Windows bootloader?
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Apr 12, 2011
Currently I installed Windows Starter, then installed Fedora 15 Alpha from the 'Fedora 15 LiveCD'.Now, I have reinstalled Windows Starter and now my grub loader has been removed.How can I get the grub loader back, with just the LiveCD?Is it possible to do this without the LiveCD?
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Apr 14, 2011
I deleted the wrong line in grub.conf, and now cannot boot into my Windows Vista anymore. I really need to get it back right away, I am trying to do my taxes, and they are on there, and I can't get to them. I added this to grub.conf, but no luck.
Vista
root (hd0,0)
chainloader +1
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Apr 4, 2011
I have a distribution called Easy Peasy on my netbook, it's Ubuntu-based.Today when I started it up it told me 'grub corrupt'. On subsequent start-ups it displays 'unknown filesystem.' I'm given a prompt labelled 'grub-rescue>' but I can't get any commands to work I've tried booting off a Live CD of Easy Peasy. That works fine, but I can't get to my files. I've tried using a program called photorec and it can recover files from the drive but it dumps out gigs upon gigs of unlabelled files, many of which are things like system files or web browser cache -- I only have a few dozen text files I actually need, so this is pretty unworkable.
I'm trying to reinstall grub, which I understand to be part of the booting process, but I've had no luck; any set of instructions I've followed has inevitably run into some error or a step I don't understand.How can I get at my files in an easy to recognise way (such that I can navigate the original directories and get what I want)? OR
How can I easily reinstall grub such that I can just use the system like before without having to reinstall everything and lose my files?I think my drive is sda or sda0. In grub's device.map it's called hd0.
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May 7, 2009
I am using CentOS 5.2 with GRUB booting a software RAID configuration. The first disk is md0 and is mirrored across sda1 and sdb1.I manually re-installed grub using grub-install and the machine will no longer boot off of the HD. The grub menu comes up, I can select my kernel the machine then jumps to loading the initrd and hangs.It will go no further. I have a live DVD that can boot from the HD. If I use that to first boot from the DVD, then specifiy the HD, it shows the same grub menu and then the machine boots fine w/o the initrd hang.I have tried re-installing grub but not been able to get the machine to work again w/o the DVD.
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Jun 7, 2010
When I try to boot into windows through grub it just returns to the grub menu.also system recovery options from bios just end up in grub screen too.here is boot script.From reading forums I think I need to get grub out of windows partition but I don't know how
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Jul 23, 2010
GRUB has not updated properly for some reason, and now I am left with an un-bootable system. I would like to know how to re-install grub without needing to re-install Ubuntu.
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Aug 31, 2010
I've had nothing but trouble with GRUB2. Is it possible to use the original GRUB bootloader?
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Oct 30, 2010
Anyhow, I'm a n00b to the Linux world, so I installed it on my Windows 7 desktop to dual boot. Current configuration is as such:160GB HDD with 3 partitions: Ubuntu Studio 10.10 on one, Win 7 on another, and the third is for storage.1TB HDD for extra storage.So far, all is well, but I'm not pleased with the default GRUB options and layout. It gives me 4 options to choose:
-Ubuntu Studio
-Memtest
-Memtest Debug Mode (or something to that effect)
[code]....
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