Ubuntu :: Grub Boot On External HD - Error 21 If Disconnected
Jul 5, 2010
Here is my current setup for my laptop: I dual boot Windows Vista and Ubuntu 9.04. Vista is on the laptop's HDD while Ubuntu is on an external USB HDD. When turning my laptop on, if the external hard drive is either not on or disconnected, I get "Error 21" and nothing happens. Normally this wouldn't be a problem, but when I need to take my laptop somewhere where I do not have access to my external HDD, it is rendered completely useless. So is it possible to set up GRUB (or possibly another bootloader) to boot regardless of whether or not it detects the drive Ubuntu is installed on?
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May 25, 2010
I have Ubuntu/Vista dual boot desktop with Single HDD (200GB) that i cloned to an external USB HDD (320GB) using clonezilla. My intention is to use the external HDD as a backup to up running in case my 3 year old desktop HDD fails. To make sure the clone is good to use if need, i connected external HDD to USB port and tried boot from it but got "Error 18". I tried to Google got some infoDid a fdisk -lu and got the following.
Code:
Disk /dev/sda: 200.0 GB, 200049647616 bytes
255 heads, 63 sectors/track, 24321 cylinders, total 390721968 sectors
[code]....
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Feb 13, 2009
I downloaded F10 x86_64 live Developer Spin ISO file from fedora project spins website and burned it onto a DVD...Now when I try to boot from it, I get a menu as usual. Here I select the 'boot' option. Now it shows a 'loading' page with a progress bar and 'Fedora 10' written on the right side [as usual].. After that, on the next page I get the following error..
error: unexpectedly disconnected from boot status daemon I somehow did a reboot, and again the same problem. Microsoft XP and another Fedora are already installed on the same system..
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Jul 8, 2011
I am new to Linux. I have installed RHEL 5.4 on my PC with preloaded Windows XP.
Windows was set as the first boot kernel. So if i do not choose which OS to be loaded it will load Windows by Default.
Today I got an error saying GRub Loading Stage2 read error.
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May 16, 2011
we have an oracle application server on red hat 4.6 upon booting it comes up with error: attempting boot from hard drive (c GRUB)
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Apr 9, 2011
I recently decided to try out openSUSE 11.4 with gnome and install it on my external USB HDD. To do so i followed this guide here SDB:Installation on external hard drive - openSUSE
Unfortunately after finishing the install when trying to boot into the system i got GRUB error 17. The only thing i did differently from the guide was placing the /boot partition after a ~800 GB NTFS partition with my data.
I tried to solve the problem by reinstalling the system with different settings than before. After completing all of the steps in the guide mentioned i disabled booting from MBR and enabled booting from /boot partition. Also set the installer to write generic boot code to MBR.
Though after the installation i realized that grub is not loading at all this time and went on to fix it by completing the steps here SDB:All about GRUB - openSUSE . After doing so i'm back to GRUB error 17.
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Sep 30, 2010
I cant boot from my External HD with ubuntu installed.
I get this message:
error: file not found. grub rescue>
In an attempt to fix this problem, I tried using the following sudo command:
sudo mount /dev/sda5 /mnt
sda5 does not exist, I tried 4, then 3, then 2, and it worked, but that was a partition of my internal HD containing windows 7.
I also typed in:
sudo grub-install --root directory=/mnt /dev/sda
not I get the following error when I try to boot from my internal HD:
error: no such device: 57288a24-5d12-4fb1-b27e-eb09a1f9b7c6. grub rescue>
Is there a way to get grub to boot into windows 7 again?
When I type:
sudo fdisk -l
I receive a list of my drives and their partitions, This is my assumption as to what drive is
Which:
/dev/sda1 = Vista loader, for Windows 7
/dev/sda2 = Windows 7 (At least I hope its still there.)
/dev/sdb1 = Bootable Flash Drive.
/dev/sdc1 = External HD.
The text from the terminal is as follows:
Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x8da4c52c
Device, Boot, Start, End, Blocks, Id, System.
/dev/sda1, 1, 1355, 10877952, 27, Unknown.
/dev/sda2 *, , 1355, 38914, 301961224, 7, HPFS/NTFS. (The commands changed this from FAT32)
Disk /dev/sda: 8054 MB, 8054636032 bytes
8 heads, 32 sectors/track, 61451 cylinders
Units = cylinders of 256 * 512 = 131072 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier:0x00000000
Device, Boot, Start, End, Blocks, Id, System.
/dev/sdb1, *, 1, 61452, 7865839+, b, W95 FAT32.
Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 =8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier:0x0000a613a
Device, Boot, Start, End, Blocks, Id, System.
/dev/sdc1, *, 1, 30402, 244197376, 83, Linux.
Eventually I would like to fix the error I get when I boot from the external, I would like to to boot to ubuntu, but for now I am concerned with getting my internal HD to boot windows 7. Where I originally found the terminal commands to begin with. I think sda5 is where linux was installed in the example I found, and didn't realize it.
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Jun 12, 2011
I have grub 1.98 and it boots fine with out my usb hdd connected but brings me to grub rescue when it is.
It takes me to grub rescue and tells me that it cannot find device: "UUID"
This UUID is not even the UUID of the drive that I cannot plug in if I want my computer to boot to grub.
Here is blkid with the usd hdd plugged in after boot:
Code:
/dev/sda1: LABEL="System Reserved" UUID="BA56FD4B56FD0941" TYPE="ntfs"
/dev/sda2: UUID="E23E02D93E02A71F" TYPE="ntfs"
/dev/sda3: UUID="9579da2d-5ba0-407c-a95d-9f134a1417f3" TYPE="ext4"
/dev/sda5: UUID="caefabd7-c8f0-4fca-8005-d682ae939b91" TYPE="swap"
[Code].....
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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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Feb 6, 2010
I tried to install Ubuntu on an external drive, but it doesn't boot, but it installed GRUB on my main HD, and now I can't even boot Windows. I only get a "grub rescue" prompt. I need to remove GRUB. How to do it?
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Apr 7, 2010
after doing an upgrade to 10.4 and updating grub I get this message. how do I address this
[Code]...
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Jan 11, 2011
It started when I wanted to dual boot Windows 7 and Opensuse off of my netbook (No DVD/CD drive) I tried install suse from an external hard drive and I botched it. I ended up erasing EVERYTHING off of my internal netbook hard drive. Windows and all.
Well, I had a couple of other computers so I studied up and eventually successfully installed OpenSUSE 11.2 on my external hard drive (11.3 being the one that I accidentally erased everything with, so kinda scared of it) and now I want to install openSUSE 11.2 on my internal netbook hard drive.
I can not use disks
I can not use a flash drive (For some reason, even if I make it bootable, it will not load up, this could be because it's actually a 8GB microSD card that is placed in a USB card reader.)
I can not use an external hard drive because that's what I'm running suse off of.
I've tried reading up on how to install suse on another drive off of the hard drive and I've gotten as far as whenever I boot up the netbook with the suse external hard drive connected it will ask to boot into OpenSUSE, the Fail Safe, or to install OpenSuse. When I select to install it it gives me the Error 18 Unknown File system.
I've tried formatting the internal hard drive twice. One as NTFS and again as EXT4. Neither seems to effect it other than when it's ext4 I can open it and it contains a Lost and Found folder.
When I interrupt the boot sequence by pressing c and going to the terminal and I use the root (hd +TAB command it tells me I have a hd0 and a hd1. The hd1 only has 1 partition which is ext4, which I'm assuming hd1 is the internal hard drive (I'm not sure how to check) and the hd0 is the external hard drive, which has three partitions. One with an unknown file system and two with ext4. When I try to enter the set up from the terminal it gives me the same error for any thing I put it (e.g. root (hd0,0) gives the same error as root (hd0,1), or root (hd0,2) and root (hd1,0)
Something like it cannot locate these two files I'm assuming it needs to boot. If anyone finds this relevant I'll retry it and post the files its missing.
I've been searching for awhile and can't find any threads that can solve my problem. From other threads, however, I have noticed that I should probably include my menu.lst, listed below
Code:
I have also ran the boot info script and received the RESULTS.txt file it generates. Listed below
Code:
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Feb 6, 2010
not sure what happened, yesterday i installed the new kernel and played around a bit by uninstalling some older kernels. Everything was fine but now i cant boot into ubuntu any more. I have a Dual boot and Grub let me boot into windows. for linux grub gave error 17 (if i remember correctly).o i popped in the LiveCD and tryed gparted to check for errors (nothing changed). I tried rewriting grub from the live cd and that made matters worse.
Code:
grub> find /boot/grub/stage1
find /boot/grub/stage1
[code]....
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Sep 4, 2010
I installed Ubuntu 10.04 LTS on a machine with 8.04 LTS, and have dualboot between those i system.The problem is when a start a get a message:'Boot error'If I hit 'Esc' I get to the Grub -meny and can boot as normal.
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Aug 21, 2010
Im using Ubuntu 10.04 64bits with external journal.
/dev/sda1 is the "/" partition.
/dev/sdb1 is the external journal
Everything is working fine, but if a new HD is added (like dev/sdc), I have a boot error, initramfs error!
Why this is happening? How can I add a new HD without error?
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Oct 12, 2010
So the other day I just booted into ubuntu and the there was no internet connection, didn't think much of it, I can still connect in windows. The thing that's curious though is that it shows my wireless network under connection with full signal, I click to connect to it, it tries to connect for about a minute and the says "You are now disconnected"
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May 21, 2011
Ubuntu 9.10 was set up to handle the booting selection - previously I thought it was xp but Ubuntu 9.10 "did" it. The system started out as a xp / ubuntu 9.10 dual boot on a 400gb drive. xp has 210gb, ub has 80 and their is a 100gb shared storage. Xp was installed first and then I followed a guide over at linuxconfig.org to get ub installed so that I could select which OS was wanted at boot. Ubuntu manages the boot up menu (Went back to look at my notes from the original setup) The owner tried to update to ub 11.04 and afterall was said and done the machine now boots to the message
error file not found grub rescue I can't say if 11.04 was properly installed or not. Ask whatever you like and I'll give the best answer I can. I think the xp install is okay but I can't say for certain as I don't know how to boot it outside the bootmanager at startup. Data has been saved so if I have to blow it all away and start over I can but I'm hoping I won't have to.
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Jul 10, 2009
I've been running Debian Lenny kernel 2.6.26 w/ desktop kde3.5 on my laptop for a while, and im going to take a trip in which i will be unable to take wmy laptop with me. However, where i am going contains computers and i figured if i could install debian onto my external harddrive, i could just boot onto the other computers. I install it using the debianlenny-i386 dvd image. However whenever I try to boot it from a computer. Grub returns
Code:
Grub Loading...
Error 21
and then the blinkng cursor. On one site i found something saying "you may need to activat the drive" and some command-line instructions on how to do it. However the commands have faded from memory and i am now unable to find that site again. Could anyone offer insight on how to fix this "grub error 21" or how to activate it. I run primarily debian but i have a windows partition on one of my relative's computers.
Thank you in advance for the help!!!
btw I'm installing on a western digital 500gb "passport" external hard drive with ext3 and swap partitions.
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Apr 30, 2010
After upgrading to 10.04 from 9.10 Win7 wouldn't startup any more. So I tried this HowTo: [URL] to restore Grub2. But now each time I boot up I get this two lines: error file not found grub rescue> I have NO idea what to do.
[Code]...
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Jun 17, 2010
I'm trying to fix the partitions on my laptop. how it was setup before I made the change:
[code]...
I shrunk the windows partition to about 150 gigs, and used the unallocated 25 or gigs and formatted it as ext4 and copied dev/sda1 to it. Now I have all the same as above now with
[code]...
I had two installations of ubuntu and deleted the sda1 partition. Now I get a GRUB Error 17 when I boot. I'm in a live CD and I have access to a console, how can I reconfigure GRUB?
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Sep 4, 2010
Edit: This is somewhat inaccurate, please see post #16 on page 2 for my actual situation
I'm more than a little confused by this. A little while back I had to reinstall my machine because I had a hard disk failure and I replaced my primary drive.Everything went perfectly smoothly, but then a couple of weeks after that when I rebooted, it dumped my into the grub rescue console
Code:
error: out of disk.
grub rescue>
So, I found a solution to the problem on these forums, rebooted perfectly fine, and thought everything was fine. Until the next time I rebooted, when it happened again. And now, every single time I reboot, I get the same issue.I have to do the following, each and every time I want to reboot - and i'm at a loss to explain why grub is borking itself every time.Boot off a live cd.Open a konsole window
Code:
sudo su -
mount /dev/sda6 /mnt
mount /dev/sda1 /mnt/boot
mount --bind /dev /mnt/dev
[code]....
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Sep 23, 2010
managed to get things working so well on my laptop i thought i'd install ubuntu onto an external drive so i can boot to either xp or Ubuntu whenever i want, when i started up after the install it doesn't recognise the drive i loaded it to and appears to have lost the link to xp. the exact words are:
error: no such device: 4368f21f-d1b6-4c60-8c6b-4d2d38d16920.
grub rescue>
what i can do to get my xp back, my wife uses the xp and will kill me if i don't sort it, fortunately the comps unrealiable anyway!
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Feb 13, 2010
I used proprietary software (acronis trueimage) to clone an Opensuse 11.1 machine, onto another machine with somewhat distinct hardware (different motherboard, less memory). I expected to have to change entries in /boot/grub/menu.lst, /etc/fstab, etc. I was told a good way to do this was to use the Opensuse DVD's "repair installed system" feature.
When I ran the repair, I was informed that "bootloader configuration file contains errors". I attempted to re-install the bootloader, but received this unhelpful error: "An error occurred during boot loader installation. Retry boot loader configuration?". When I boot the system, I just see the text "GRUB ", followed by a flashing underscore character.
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Feb 15, 2010
Here the other day, I decided to try out 10.04 Alpha. But after I had done it, I weren't able to boot Vista anymore. When I choose it in the grub boot loader, it changes to only showing the word "GRUB", and nothing more happens. As a desperate attempt to fix it, and because I weren't happy using the Alpha, I then decided to switch back to 9.10, but the problem with booting Vista persists.
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May 12, 2010
In the past month or two I've run into a strange problem where Grub gives error 18 "Selected cylinder exceeds maximum supported by BIOS". Strange because:
1) after a few tries it mysteriously starts working again without any change on my part
2) I am not running a dual boot system, which seems to be the usual cause of this problem
3) though I have SATA hard drives, I have the RAID capabilities disabled in the BIOS, which can also apparently lead to this problem.
I'm currently running lucid but it also happened once before I upgraded. It seemed to start happening not too long after I installed a new 1TB drive, though that drive is only mounted under /mnt/backup, and not anywhere else of importance, so it may be a coincidence.
Here are some specs on my machine:
BIOS is ALive NF6G-VSTA P1.80
I have 2 SATA drives (no IDE drives except DVD-ROM):
/dev/sda is a 200GB Samsung drive with two partitions
- sda1 is about 197GB and includes / (including /boot)
- sda2 is about 3GB of swap
/dev/sdb is a 1TB Western Digital Drive
- 1 partition mounted at /mnt/backup
If the problem is that I don't have a separate partition for /boot, shouldn't the error show up every time I boot, not just once in a while?
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Jul 8, 2010
then my computer starts black window opens error: no such partition grub rescue>
[Code]....
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Jul 30, 2010
I have an IBM T60 which already had Windows 7 and Ubuntu 10.04 running fine in dual boot. For work reasons, I also needed Windows XP, so I started to install it last night. The install didn't work because of lacking SATA drivers, but when I tried to reboot my computer, GRUB was giving an error. [grub rescue>] Rebooted with the live CD and attempted to reinstall GRUB, but I still get the same error when I restart. I reinstalled GRUB with the directions from here: [URL]...
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Sep 10, 2010
I just installed Ubuntu on a computer but it can't boot, it ends with a greb-rescue error.
What shall I do? Here's my fstab and my sudo blkid. I did an ubuntu side installation with xp.
Le FSTAB
# /etc/fstab: static file system information.
# Use 'blkid -o value -s UUID' to print the universally unique identifier for a device; this may be used with UUID= as a more robust way to name devices that works even if disks are added and removed. See fstab(5).
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sda5 during installation
UUID=3a307ad3-99a9-4301-8ad0-f601ef9d157c / ext4 errors=remount-ro 0 1
# swap was on /dev/sda6 during installation
UUID=5b3ff501-f07c-4c2e-ac2d-a238b599cbe2 none swap sw 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0
SUDO BLKID:
/dev/sda1: LABEL="System" UUID="26AC3F75AC3F3E9D" TYPE="ntfs"
/dev/sda6: UUID="5b3ff501-f07c-4c2e-ac2d-a238b599cbe2" TYPE="swap"
/dev/loop0: TYPE="squashfs"
/dev/sda5: UUID="3a307ad3-99a9-4301-8ad0-f601ef9d157c" TYPE="ext4"
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Jan 15, 2011
I was trying to install Backtrack - Ubuntu dual boot with ubuntu pre-installed. I created another partition for backtrack but now grub doesn't point to the correct file in order to start Ubuntu, and so only backtrack starts. How can I correct it? I am able to mount my Ubuntu Partition and the files at /boot/ (in the ubuntu partition) mentioned at menu.lst at /boot/grub/ on the backtrack partition seem to exist... Does anybody know what should I do? (e.g. point menu.lst to the /dev/sda1/boot/IMAGES or something?)
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May 6, 2011
I am persuaded now (too late) that I need to invest in a robust backup scheme.
I had refit dual-booting snow leopard and ubuntu 10.10.
I tried to upgrade to 11.04 and it got stuck on bootup after the upgrade.
So I went into disk utility and deleted what I thought were all partitions except the mac one. I rebooted, and now I get the grub no partition error.
Did I delete my mac partition? I don't think that I did. How do I boot back into mac os x? Using the option key on bootup no longer shows a mac disk and inserting the mac os x system cd doesn't show any options either.
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