Ubuntu :: How To Avoid Grub Rescue
Feb 15, 2011
I'm working on a managed desktop at work with Scientific Linux so I decided to install latest Ubuntu 10.10 on my laptop, an Aspire 6930, and set it up so it dual boots with Windows Vista.
It boots for the first time,everything looks great and it asks me to update some programs.After it does that,I restart and I get a grub rescue message while there was a strange clicking sound coming from the hard disk. I reinstall Ubuntu through BIOS with a CD and I bring the system to the original state.
I can now boot either with Ubuntu or Vista but I don't dare update the programs it prompts me to as I fear it will lead to the same result. It's been like this for the past month and I was wondering if there is a way to know what actually caused the problem in the first place assuming that is has to do with a program that was updated.
Truth is that the specific model has this problem with the hard disk that makes that constant clicking. When running Vista I have a program called Notebook Hardware Control which lowers some settings and stops the clicking.When running Ubuntu, there isn't any. So is there a way to know which program can cause such an error and refrain from updating it?
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Dec 16, 2010
I updated yesterday and now when I start my laptop it goes in to grub rescue mode. I have booted from a 'live cd' and thought I could repair grub from there. In gparted however the partition with ubuntu (sda1) is seen as unknown file system, in terminal when I list the partition table it shows up as FAT16 type. When I try a grub-install it gives this error message:
[Code]....
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Apr 11, 2010
First the hard data:
Upgraded from Ubuntu 9.04 to 9.10 via upgrade manager
System is AMD 64
Have dual boot with XP on seperate hard drive
[code]....
Then the wheelspin:
Seem to have knocked out GRUB as normal loading screen does not appear anymore.
Worse, I think I accidently installed grub to something labelled SDC5.
Cannot get anything except the "grub rescue" prompt. I'm not sure if using the LiveCD (9.10) can help. Have tried a few prompts from other threads but just ended up with mud splattered all over the place. I'm gathering I need to load grub, but can I do it using any grub rescue commands?
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Jan 31, 2010
Yesterday I partitioned my hard drive with kubuntu netbook remix and windows 7. after a few hours and reboots i turned on my computer and it said Grub loading. unknown filesystem rescue grub> It looks like allot of people have been having similar errors recently with windows 7.
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Jan 15, 2011
So I wanted to get rid of ubuntu 10.10 on my HP pavilion dv6 laptop as I wanted to make some hd space. Its a dual boot with windows 7. I deleted the ubuntu partition and expanded the windows partition to fill the whole hard drive again. When I restarted my laptop I got the "error: no such partition. Grub rescue>" message.
I tried inserting my ubuntu 10.10 boot cd but whenever I boot from the cd I get the exact same grub rescue error. Is it possible to remedy this situation from the error? I am currently unable to download a windows recovery cd so I'm stuck in the grub rescue page unless its possible to fix this mess from the error prompt.
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Jan 16, 2010
Why does Windows (7) [over-]write the MBR [pseudo-randomly]? And what settings can I change to prevent that?
Background : I used to dual-boot Ubuntu and Windows-7 on my gaming-laptop, but periodically I run into GRUB-got-messed-up-please-fix-me-again welcome screens. how-to guides on restoring GRUB, but no obvious ones on how to avoid messing up GRUB in the first place. Whats interesting to note; I have another work-laptop that dual-boots Windows XP and Ubuntu just fine (for the past year) and have never run into any GRUB-got-messed-up-please-fix-me-again situations.
My Hypothesis : I have a hunch that Windows 7 writes to the MBR for enabling Restore-Points.
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Jul 18, 2011
I had opensuse/winxp running.
First windows xp wouldn't boot - then opensuse **** out and I had nothing but a black screen. I spent about two days trying to figure out what in god's name happened. I finally got a copy of winxp recovery disk and it couldn't find the partition that windows was on. That gave me some idea of what was going on. So I tried to fix the matter from partitionmagic. I reinstalled grub making sure that everything was associated properly. I still couldn't get either opensuse or windows to boot after many many different trial and error attempts.
After deciding there was no help for it. I decided to slave my hard drive and wipe to start over. So I booted partition magic from USB and deleted my opensuse partition and -what do you know - windows booted right up. Aside from feeling windows xp's smug grin as the logo appeared - i am perplexed as to how this happened. My guess is that MBR tried to overwrite grub. But I think that the loader was confused and trying to boot from the wrong partition.
I want to reinstall opensuse again. However I want to make sure that this doesn't happen. I need my xp partition for examsoft because wine doesn't seem to work for it and I can't vbox it. So is there some way to make sure that when I do install from DVD on my USB that:
1) repositories are correct
2) MBR doesn't overwrite grub (should I install Grub2 or LILO?)
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Jun 23, 2010
Ubuntu 10.04 was in small slave-disk, and I put other bigger disk same type IDE/ATA.In first start I get message: "no such device....., grub rescue."Anyway, I make installation in this disk and and now after start message is: "error: out of disk, grub rescue.So now I can not use master/XP and no slave/Ubuntu.
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Aug 27, 2010
I have a vista/ubuntu system. I tried to restart the computer into vista and it came up grub rescue. I did what someone suggested and typed in grub rescue> set prefix=(hd0,5)/boot/grub grub rescue> insmod (hd0,5)/boot/grub/normal.mod rescue:grub> normal Anyway that got me into a menu where the ubuntu server is. I chose it and it sends me into tty1 where it asks for my login My login when the machine used to come up log/pass was dan/mypass
but in the tty1 it says login incorrect. I need to get back into my server. I'm not sure why it's messed up. So how do I do it.
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Nov 24, 2010
I'm a linux/unbuntu n00b and having some major issues here. I am new to using Ubuntu and have been experimenting with it on my netbook as well as kubuntu and a few others. I love the linux alternatives to Windows. It started with me running Windows 7 Starter along side Ubuntu. I was trying to resize my Windows partition and give Ubuntu more space. I managed to somehow delete the wrong partition, making a very careless mistake. Long story short, my netbook is stuck at the grub rescue screen and I have been searching the net for about 3 hrs just tonight plus whatever time I spent last night searching and cannot get this fixed. I've tried booting from the flash drive using Unetbootin and it will say "Missing operating system" before the grub rescue prompt and I did change my boot sequence. I've also tried using some commands in grub rescue and got various messages such as, no such disk, no such partition, cannot find "grub_xputs", cannot find C/H/S values...
I have a Gateway LT21 netbook with a 250gb hdd. Any help is appreciated. I realize this is a common issue and has been posted a lot but I have searched and my issue is on going and I'm guessing its specific to my setup.
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Dec 7, 2010
I have an Ubuntu 10.4 installation (dualboot with windows XP) with grub2.After I resized some of my partitions using a gparted live cd, the system goes directly to grub rescue mode every time I boot.Then I follow the instructions which are given in grub2 wiki site to boot.The grub boot directory is now located in sda6 (hd0,6) in my system as found out using 'ls' command.
But in the grub rescue mode when I enter the 'set' command (one of the very few commands available), to display current prefix and root, it gives "(hd0,7)/boot/grub" as 'prefix' and "hd0,7" as 'root'.After entering the following commands, I'm able to boot.There are other users at my home not familiar with ubuntu. windows is their OS of choice. So I don't want to remove windows installation .One solution that I can think of is creating a grub rescue CD using grub-mkrescue, then using windows cd to fix mbr (which will overwrite grub? or the pointer to grub?) and then using the grub rescue cd to boot into Ubuntu but I'm not sure.
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Jul 28, 2011
I own a Sony Vaio VPCEB3AFM. It came with pre-installed Windows 7 Home Premium 64bit, no disks or anything. The product key is on the back of the laptop. I later installed Ubuntu, as I was beginning to take an interest in the potential of computers and began to explore with different Operating Systems. I installed it along side Windows 7. THEN, me being the dumbass I am, installed BackTrack 5 also. I then called Sony in attempt to restore my computer to factory defaults and just have Windows 7 as my only operating system. I shut my computer down and then hit F10 until the Vaio Rescue shows up. It was in the process of Restoring when it restarted and an error message came up. It reads, Error: No Such Partition Grub Rescue>. I have no idea what to do none of the OS boot up when I start it. I have no disks, I have only Ubuntu on a USB drive which I boot up by changing the BIOS blah blah. But when I do not have it in, the error message occurs.
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Jun 5, 2010
I've got Ubuntu 10.04 installed on one partition, and Windows Vista on another. I was messing around with my partitions, and now I can't boot to either one. I just get an error when I boot up on GRUB which says "error: no such partition", and then a prompt saying 'grub rescue>'. I've read up on other people's posts, and they said that I should reinstall GRUB from a livecd, but that doesn't look like it does anything. It seems that GRUB is trying to boot from hd0,8, and that doesn't exist anymore. I can change the 'root' and 'prefix' variables to the right partitions, but the 'boot' or 'chainloader' command doesn't work. You should be able to boot from 'grub rescue>', because that's what it's for, right?
I just want to be able to boot into Ubuntu, not Windows.
PS: Sorry if I'm specifying way too much information(or not enough), I'm fairly new to forums.
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Aug 4, 2010
Yesterday I made a thread about going back to Windows as I'm giving this laptop to a friend. Anyway, after I finally got Windows to re-install I'm now stuck with "grub rescue" instead of the OS booting. Is there anyone who knows a way I can get rid of grub rescue and get Windows to boot?
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Sep 28, 2010
I know this is a common error, but my situation is a little different than previous threads on this issue and I just want to make sure I get the correct solution.
Basically, I had Ubuntu 10.04 and Windows 7 on my netbook and wanted to try a more lightweight version of Ubuntu. After settling on LXDE for a desktop, I decided to install Lubuntu 10.04. I chose not to install LXDE over regular Ubuntu because I wanted to eventually end up with an Ubuntu distro with either GNOME or LXDE, but not both. So rather than put myself through the hassle of uninstalling all the GNOME or LXDE packages, I decided to keep them each on separate partitions.
In the end I decided to just stick with regular Ubuntu and deleted the Lubuntu partitions. Now I get the GRUB error written in the title of this thread.
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Nov 26, 2010
I lost power during my Ubuntu update and when I powered back up ubuntu was broken. Now the stupid bit. My hdd was partitioned into 3 bits, vista os, data, and ubuntu. In vista I deleted the ubuntu part and merged it with the data part. Now when I power up my computer it goes straight to a black screen that says...
error : no such partition.
grub rescue> I have looked through the forums for an answer to my problem but to no avail. When I put the ubuntu live cd in and turn back on itjust goes to the same screen. I'm a novice to the world of computers and need any help you can offer.
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Nov 29, 2010
I have recently decided to try out Ubuntu(Lucid Lynx) using wubi. Everything was absolutely superb and realizing that I have a lot to learn and looking forward to it. Everything was fine until I updated and ticked 2 boxes for updating grub and restarted and couldn't boot into anything. I have xp on 80gb 2.6 celeron, and Ubuntu loaded through wubi on 320 gb external hard drive.
error: no such device??????????????????
grub rescue>
It may seem a little slow for me to put to the test your responses, because I will have to disconnect the PC that I am using and use those connections on the 2.6. This one I am using at the moment is 400hz p3.
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Dec 3, 2010
I uninstalled ubuntu from my main HDD, and its now on a different HDD. when I turn on my computer I get:
Partition not found
Grub Rescue
I've used my windows disk and repaired my mbr and boot (bootrec /fixmbr bootrec /fix mbr) multiple times, yet I always get this problem.
Only way I can boot windows is if I leave my install disk in my drive. It will say press any key to boot from cd / dvd I just wait a couple seconds, and it boots into windows. Without the disk, I get the grub problem. I have only 1 partition on my HDD, and that is my windows 7 partition, nothing else.
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Jan 21, 2011
Update Manager showed updates available so I installed them about 1hr ago. When the update was complete I clicked the "Reboot to complete installation" button.
Upon reboot I received the following error message...
Code:
Kernel panic -not syncing : VFS : unable to mount rootfs on unknown -block(0,0)
Pid :1, comm: swapper Not tainted 2.6.35-24-generic #42-Ubuntu
I rebooted and was taken to a boot menu. Both the most current version 2.6.35-24-generic and 2.6.35-24-generic[Safe Mode] gave me the same errors so I booted the the previous version 2.6.35-23-generic
I then ran the following in the console...then did a reboot
Code:
sudo update-grub-update
The result was Grub Rescue Shell where I did...
Code:
set root=(hd0,1)
linux /vmlinuz root=/dev/sda1 ro
initrd /initrd.img
error: couldn't read file.
initrd.img is there but it can't be read.
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Feb 20, 2011
I installed Ubuntu server with software raid 5 and all went well. Then I figured I should test the raid by these instructions [URL] As a result mdadm would create /dev/md0 with 3 drives and 1 spare. Confused on this matter I just reinstalled Ubuntu. Now, I'm greeted with a grub rescue prompt at boot. Running set displays the correct parameters and ls (md0)/ shows the content of /. However, ls (md0)/boot/ shows no content what-so-ever. If I boot from the livecd there are all the files needed in /boot. I've tried running grub-install on all the drives without results.
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Feb 25, 2011
I running a dual boot of 10.4 and windows 7 and was trying to add a free disc space to one of the partitions using gparted and the window 7 tool. On restart I get this DOS-like message:
Code:
Error: file not found.
grub rescue>
From what I have gathered, from other posts I should
1. Go here [URL]
2. Reboot and run ubuntu from the live CD
3. Create a results.txt file
Here is the results data:
Code:
Boot Info Script 0.55 dated February 15th, 2010
Boot Info Summary:
=> Grub 2 is installed in the MBR of /dev/sda and looks on the same drive in partition #5 for /boot/grub.
=> No boot loader is installed in the MBR of /dev/sdc .....
Devices which don't seem to have a corresponding hard drive
sdb
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Mar 11, 2011
i am getting this error at startup
grub rescue:
i have an live cd and i have tried all the methods and i am just going in circles.i am not getting any proper or definite answer.i can just open my C drive from kubuntu and im getting hundreds of errors in konsole like permission denied or bad superblock etc....
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Mar 12, 2011
I'm having a issue. It first started a few nights ago, and after booting from the live cd and reading around, I saw it mentioned somewhere that it might help to update GRUB. I did this using sudo update-grub. This took care of the issue, with an unexpected, but not altogether unwanted result: instead of having to choose a temporary boot device to boot on to the external drive Ubuntu is on, I got a grub menu which showed the the OSs for both HDDS. I thought all was fine, but a few days later, same thing. Updated grub again, and all was okay. Tonight, it happened again.
When I try to update grub now it says:
Code:
ubuntu@ubuntu:~$ sudo update-grub
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
Here's the result of the boot info script.
Code:
Boot Info Script 0.55 dated February 15th, 2010
Boot Info Summary
=> Grub 2 is installed in the MBR of /dev/sda and looks on the same drive in partition #1 for (,msdos1)/boot/grub.
=> No boot loader is installed in the MBR of /dev/sdb .....
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Mar 19, 2011
I've tried reading other threads about grub rescue but it seems like it only works if the USB stick can actually be read. Sorry if I sound dumb, I'm really new to all of this.I installed Jolicloud (it's based off Ubuntu, apparently) to dual boot with Windows 7 which I got with my netbook. When I tried to get rid of Jolicloud, I think I accidentally deleted a partition-- now whenever I boot up my netbook, I get the black "grub rescue" screen of death.
I tried getting the netbook to boot from my USB but it won't do it. The USB light flashes but nothing happens. I know there's things in there because I can boot from the USB using my desktop. Jolicloud was initially installed from the USB so I don't know why it won't read it anymore.
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Apr 13, 2011
Just did a full install of the latest version of Ubuntu. I've got a high-end alienware m17x laptop with dual SSD drives in a raid array. Ubuntu installed fine, but when I reboot, I get to a grub rescue prompt and it never gets to desktop. I'm booting from the liveCD while I try to figure out how to fix it.
[Code]....
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Apr 21, 2011
Month or so ago I ran into BusyBox, so while reinstalling Ubuntu 10.04 onto to that first FreeBox HD from a live CD, while manually adding & editing a new partition with free space to put Ubuntu into, I must have accidentally edited pre-existing partitions possibly deleting everything off of that HD. After reinstalling, I went into the terminal & ended up trying to recover or restore the partitions that I thought were lost or deleted or struck sick (since it had BusyBox). But that broke it. Now, after breaking that first HD of mine, when booting, I run into the following at startup:
error: no such partition.
grub rescue>
Right now, I have that first HD as my slave HD I can no longer find this HD, I can't load into it. It might have died because it was making noises the last several weeks. But just yesterday when trying to get into this same first HD from Ubuntu, I'd receive this message:
Error mounting: mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
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Apr 30, 2011
The day that the upgrade came out (not beta, the true release) I upgraded via the Update Manager. The upgrade went great until it asked me to reset to finalize. Upon doing that, I was greeted with a less than friendly grub-rescue> screen. The materials I currently have at my disposal are a 10.10 installation disc, and an 8.04 installation disc, and a rescatux disc (super grub) that seems to yield an error upon any of the four options presented... how can I use these (both have Live CD) to fix the grub...
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May 20, 2011
I recently plugged the hard drive from my parents' old computer into my computer's motherboard to copy some files (it's an IDE drive if that makes a difference). I copied all the old family photos and whatnot into a folder on my Vista 64bit desktop which runs off of my computer's main hard drive. I shut the computer down and unplugged the old IDE drive and tried to start it up again. After going through the typical start up screens it gets stuck on a black screen that says:"error: no such device: 66727dd9 (morenumbers).e3cbf9f71233grub rescue>_"the cursor is blinking where the underscore is. Typically, it would go to the screen where I choose whether I want to run ubuntu 10.10 or vista.I went into boot preferences and everything looks okay.. I tried plugging the hard drive into different ports on the mobo and still nothing. All my useful files are in the Vista partition of my hard drive so I'm fine with wiping everything and doing a fresh install of both vista and ubuntu so long as I can keep those files. Does anyone know what could be causing this? I've never heard of "grub rescue"
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Jun 30, 2011
I installed Fedora on my pc over Ubuntu and now Grub wont go any further than rescue mode. (Apparently grubs boot folder was on the Ubuntu partition. Now I see why a dedicated boot partition is handy.) I used VMware to install Fedora as im currently out of CDs. VMware is setup to use the Physical HDD for the primary HDD in the VM. (I made sure VMware disabled access to the windows partitions so the guest couldn't access them.)
I am in Windows 7 at the moment and am avoiding rebooting as that will basically lock me out of the only computer I have access to. I tried running the Ubuntu LiveCD to restore grub but dont know how to mount Fedoras LVM partitions. What can I do to repair grub or at least install an MBR that is capable of booting windows? I can boot floppies and cds using VMware but am not sure what to use to fix this.
Fedora LiveCD wont mount any of the partitions to install Grub
Ubuntu LiveCD may work if I can mount the LVM partitions.
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Jul 8, 2011
So, I had Ubuntu and Mint on my second hard drive (first drive has 7), and I reinstalled Ubuntu over the entire thing (upgraded from 10.04). Ubuntu now has one drive to itself, while Windows has the other. When I did this, I booted into Grub Rescue. Restarted and switched hard drives, same thing. I loaded the LiveCD and followed this repair guide. I discovered I don't have a Boot.cfg (or .lst) or another file of the three required. I noticed my install did not have any /boot partition, so I reinstalled a few times, all with the same error. Finally, I go back to the LiveCD desktop and run the following: sudo grub-install --boot-directory=/media/[long string]/boot /dev/sda And this is the output: Code: /usr/sbin/grub-probe: error: cannot stat: /dev/sda/ This is on Ubuntu 11.04 with GRUB2 (1.99).
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