Ubuntu :: Root Disk Does Not Exist Error On Second Boot Up

Feb 12, 2009

I've downloaded Ubuntu 8.10 and I have installed it within ms windows. My first problem was when I went to boot Ubuntu and the graphics weren't right so I rebooted it with a different graphic configuration and it installed successfully. When I went to boot Ubuntu a second time to actually use it I got the following error:
ALERT! /host/ubuntu/disks/root.disk does not exist. Dropping to a shell!
BusyBox v1.10.2 (Ubuntu 1:1.10.2-1ubuntu6) built-in shell (ash)

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Fedora :: Multi Boot Error 21 - Selected Disk Does Not Exist

Nov 19, 2010

Currently I'm running 3 operating systems on my machine (in order of installation); Windows XP, Windows 7 and Fedora 14. Unfortunately, after I installed Fedora I'm no longer able to boot Windows 7/XP. When I select the "Other" option in the Grub menu, I get the following error:

Code:
Error 21: Selected disk does not exist
To provide more info, here is a boot info script result:
Code:
Boot Info Script 0.55 dated February 15th, 2010

Boot Info Summary:
=> Windows is installed in the MBR of /dev/sda
=> Grub 0.97 is installed in the MBR of /dev/sdb and looks on the same drive in partition #3 for /grub/stage2 and /grub/grub.conf.
=> Windows is installed in the MBR of /dev/sdc .....

mdadm: No arrays found in config file or automatically

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Ubuntu Installation :: Root Disk Does Not Exist - Dropping To Shell

Oct 13, 2010

Just tried installing Ubuntu 10.10 from a USB device on my Windows 7 machine but something goes wrong. Far into the installation the computer restarts, asks me which operating system I want to start (it had already done this once before) and I choose Ubuntu. Then I get three alternatives:

Ubuntu, Linux 2.6.35-22-generic
Ubuntu, Linux 2.6.35-22-generic (recovery mode)
Windows 7 (loader) (on /dev/sdb1)

I pick the top choice, and get the following message:
ALERT! /host/ubuntu/disks/root.disk does not exist. Dropping to a shell.

If I start recovery-mode i get the same message. There's some text above the message that reads "new low speed USB device using ohci_hcd and address"... Could there be a problem with the usb-drive? If I remove the USB drive I get the message: Gave up waiting for root device.

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Fedora Installation :: Error 21: Selected Disk Does Not Exist

May 25, 2011

I did a fresh install of F15, and I can not get it to boot

Quote:

Booting Fedora (2.6.38.6-27.fc15.x86_64)
root (hda,4)
Error 21: Selected disk does not exist
Press any key ton continue ...

The contents of my fstab

Quote:

UUID=9fc649bd-ea40-44ab-88f6-29afe4f26576 / ext3 defaults 1 1
UUID=2437a8af-311a-4caf-99b3-1f137df69d43 /home ext3 defaults 1 2
UUID=a6f67606-ecb6-47c4-8913-f101fc6a097e swap swap defaults 0 0

[code]....

From what I can figure out, grub can not figure out which disk has my root file system. I checked the partition labels and they match the UUID that are in my fstab.

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Mar 7, 2011

Plan to use GRUB for multiple booting to select the OS but only with luck have I got it partially to work. Windows 98 and Puppy 431 O.K on first HDD but Puppy 421 on second HDD /dev/sdb1 stops at error 21.

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Red Hat / Fedora :: Multi Boot: Selected Disk Does Not Exist?

Nov 17, 2010

Currently I'm running 3 operating systems on my machine; Windows XP, Windows 7 and Fedora 14. I've installed them in the following order: XP -> Win7 -> Fedora14, with the idea that this would work fine regarding operating system selection at boot time.

But unfortunately, I just installed Fedora, and now I'm unable to boot Windows 7/XP. When I select the "Other" option in the Grub menu, I get the following error: Code: Error 21: selected disk does not exist To provide as much info as possible, here is a boot info script log:

[Code]...

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Ubuntu :: "/host/ubuntu/disks/root.disk Not Exist. Dropping To Shell."?

Aug 22, 2010

/host/ubuntu/disks/root.disk not exist. Dropping to shell.i install ubuntu as a dual boot with xp.this msg occur a few times after i select ubuntu to boot up from...i reboot my pc a few time and even did a "update grub" finally get the ubuntu to start...but same problem occur again just now...

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Ubuntu :: Root User Directory Does Not Exist, Root Password Not Recognised?

Oct 26, 2010

I no longer have access to my root desktop. On a session I attempted to change the root username but i apparently assigned it a wrong directory that does not exist. When I rebooted with my new root username, i was instead recognised as a simple user (no root privileges). I tried the console to change to "old" root but root password is not accepted and there is no way to access to sudoer files. it seems that inserting a new username requires root privileges and i am back to square one. Simply logging with old root username and password after restart gives me a blank screen with nothing on it and cannot even reboot.

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Jan 25, 2011

I'm running out of space in wubi. Online wubi help didn't help much since they suggest creating extra virtual disk space(similar to having a diffrent partition i guess) .None of them speak about increasing the size of /root disk space(or root.disk). I store all files in space shared with windows or external disk and use ubuntu only to install and use softwares and browsing. So how do increase the available space for installing more softwares?

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Ubuntu Installation :: Disk Error - No Root File System

Feb 19, 2011

I was trying to install Ubuntu desktop and laptop edition on a Sony Vaio netbook from a USB drive, but after I select the entire disk to be used and hit enter I get this message No root file system is defined. correct this from the partitioning menu. If I try to start windows I just get s black screen.

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Ubuntu :: Root Disk Check Failed - Cannot Boot 10.10

Apr 25, 2011

I applying changes through update manager in ubuntu 10.04 then my computer froze. So I had to restart it manually.
Now I can't boot ubuntu normal or recovery mode.I get an error message saying 'the disk drive / is not ready yet or blah blah'.I don't have a livecd to fix it this with... but here is my 'cat /etc/fstab' relevant output

/host/ubuntu/disks/root.disk / ext4 loop,errors=remount-ro 0 1
/host/ubuntu/disks/swap.disk none swap loop,sw 0 0

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Ubuntu Installation :: Disk Error On /boot With Dual Boot On Dual Disk

Dec 30, 2010

I have a (slightly complicated) dual/multi boot system.

I keep getting boot errors (when choosing ubuntu from the grub2 menu)

Code:
Serious errors were found while checking the disk drive for /boot

If I switch off and restart, ubuntu will then start without issue.

My setup is like this ....3 disks, one with 10.10 clean install - so Grub2, separate partitions for /, /boot and /home, one with windows 7, one with windows XP and 10.04 wubi (this is my old disk which I will trash once I'm happy with my upgrade to 10.10 & 7 on separate disks.

I installed 7 and 10.10 with ONLY their disks installed. After both were working, I added all disks and rejigged the grub2 menu (using update-grub and StartUp-Manager).

This problem only seems to occur if my previous boot was not 10.10 ( I will investigate this further). It's as if something (grub2 ?, the bios ?) is remembering part of the previous boot and not using the grub2 menu completely.

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Ubuntu Servers :: Unable Too Boot 10.10 From ISCSI Root Disk?

Oct 12, 2010

I'm wanting to run 10.10 server from a root disk located on an iSCSI server. My server is FreeBSD 8 running isc-dhcpd and is sharing out a 20GB iSCSI disk. I've run the server install CD (currently testing in VMWare), and it finds the iSCSI share without a problem. I'm able to install the OS just fine, but the problems start when I try to boot the installation. I'm booting off a gPXE iso until I can get PXE chain-loading figured out. My DHCP config looks as such:

Code:
host mm-iscsi
{
hardware ethernet 00:50:56:3f:3f:bf;
fixed-address 10.50.3.245;

[Code]....

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Ubuntu Installation :: Error 29: Disk Write Error Then Trying Again Windows Seems To Boot But It Takes Much Longer

Aug 17, 2010

i finally decided to updgrade from Hardy Heron to Lucid Lynx. for this i made a backup of my old install, then i couldnt find my Lucid CD so i used a Karmic one to partition my old ext3 to ext4. There were some errors but after trying a few times it worked. Installed Karmic, rebooted (worked fine), downloaded all updates - (did NOT reboot to let updates take effect) and upgraded to Lucid.

Everything went fine so far. Now when i try to boot into Lucid the system hangs, i've also got a windowsXP partition on there so i tried booting that, first grub tells me Error 29: Disk write error then trying again windows seems to boot but it takes much longer than it should and seems to hang.

Then i tried Karmic and Lucid LiveCD (which i found in the meantime) none of the LiveCDs make it to boot after about 20 minutes. (previously they worked fine)looking at the errors it seems to be something about the harddrive. Why the harddrive would stop the LiveCD booting is a mystery to me but the same messages appear when i select Recovery from the Grub menu so i guess the problem is related.

[Code]...

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Ubuntu Installation :: Boot Error / Failed To Find Boot Disk

Sep 1, 2010

I had a a problem booting last night when my laptop battery came loose and caused a crash during boot.It ceased loading a daemon and I turned it off with the power switch, then I received the boot error,then i checked the linuxdrives directory and it was corrupt,I then, out of ignorance, ran wubi from within windows XP and said unistall believing that it would reinstall and fix itself.Thus you can see my green behaviour.I have been searching the threads and have tried many things but have had no success, I will suffer a great loss if I lose that load of Ubuntu as I have allot of work stored there, and in my Thunderbird accounts.

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Ubuntu :: Alert /dev/disk/by-uu... Doesn't Exist?

Apr 30, 2011

long story, I upgraded my system from maverick to natty, didn't like it so restored my system with a backup that I had done recently. after it rebooted I used gparted live CD to expand my partition, moving swap to the end of the HD, then when I rebooted grub didn't work so I booted with ubuntu live cd and reinstalled grub. then I booted normally but nautilus didn't work and had lots of problems. So I installed ubuntu again with ubuntu live cd, formating the partition and expanding it, no problems at all.But, I wanted my files back, so restored the system again, now the message that I get isQuote:

Gave up waiting for root device. Common problems:
-Boot args (cat /proc/cmdline)
-Check rootdelay= (did the system wait for the right device?)

[code]....

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Ubuntu Installation :: Dev/disk/by-uuid/xxxx Does Not Exist?

Jan 23, 2010

Fresh install of 9.10. Update all. The update froze at the very end: configuring grub-pc. I let it run like that all night before settling for a reboot while the update manager was still running. (The update also raised the kernel version.) After reboot, I tried the newer kernel [2.6.31-17-generic] at the grub menu and got this error:

Quote:

udevadm trigger is not permitted while udev is unconfigured.
udevadm settle is not permitted while udev is unconfigured.
svgalib: Cannot open /dev/mem.[code].....

And, cat /proc/modules gives me a long list of modules (too much to retype for now).So my hard drive is there. maybe some errors on the / home partition [sda6] and I can get to the root directory.

FYI: MS-win XP still boots fine from grub.

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Nov 10, 2010

User root does exist. Sendmail doesn't deliver email to local user. This is standard instalation from apt-get install. Everything worked ok since year. Everything worked ok until recently. The server worked just over a year.

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Jul 8, 2011

I'm trying to install ubuntu on a windows vista pc from a usb which I have saved ubuntu on from another linux computer but every time I select the usb drive to boot from in bios all I get is "disk error press any key to restart" on both windows and linux machines, any ideas on whats wrong?

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Ubuntu :: Grub Out Of Disk Error On Boot

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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Mar 29, 2011

I'm running fedora 14.I want to see the source code of uname.After googling,I find a way.But a problem happens.

[Code]....

Why I got this warning. After installing coreutils-8.5-7.fc14.src.rpm,where can I see the source code of uname.

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Jun 27, 2011

I am using redhat 3.0 i want to configure arp-acl mac based blocking to windows clints i have done bellow configuration but finally squd starting error is showing

#rpm -e squid warning: /etc/squid/squid.conf saved as /etc/squid/squid.conf.rpmsave
# rpm -ivh squid-2.6.STABLE6-5.el5_1.3.src.rpm
warning: squid-2.6.STABLE6-5.el5_1.3.src.rpm: V3 DSA signature: NOKEY, key ID 37017186
warning: user brewbuilder does not exist - using root
warning: group brewbuilder does not exist - using root

[code]....

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Jul 18, 2010

I've installed Ubuntu Server V9.10 (64-bit) on a brand new server I built with no previous OS installed. The drives are two Hitachi 1 Tbyte hdd's configured as RAID1, an ASUS M4A78T-E motherboard with an AMD Phenom-II cpu with 8 Gbyte of memory. I updated the bios following building the computer. The Ubuntu 9.10 server installation appears to go without error. However, on reboot I get the message:

Grub loading
error: no such disk
grub rescue

I suspect the MBR is missing or Linux is not pointing to the correct drive in the grub.cfg.I've made sure the boot order is correct, but other than that I don't really know the commands or syntax to troubleshoot this problem. The only CD I have is the Ubuntu 9.10 server ISO I downloaded and burned to dvd.

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Ubuntu Installation :: Fails To Boot With 'No Such Disk' Error?

Feb 1, 2010

I've installed Ubuntu Server V9.10 (64-bit) on a brand new server I built with no previous OS installed. The drives are two Hitachi 1 Tbyte hdd's configured as RAID1, an ASUS M4A78T-E motherboard with an AMD Phenom-II cpu with 8 Gbyte of memory. I updated the bios following building the computer.

The Ubuntu 9.10 server installation appears to go without error. However, on reboot I get the message:

Grub loading
error: no such disk
grub rescue

I suspect the MBR is missing or Linux is not pointing to the correct drive in the grub.cfg.

I'm a noob to Linux. I've made sure the boot order is correct, but other than that I don't really know the commands or syntax to troubleshoot this problem.

The only CD I have is the Ubuntu 9.10 server ISO I downloaded and burned to dvd.

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Jun 25, 2010

After updating my motherboard BIOS, I'm now getting these error messages every time I boot up:

[ 16.157447] ata3.00: exception Emask 0x100 SAct 0x0 SErr 0x0 action 0x6
[ 16.157488] ata3.00: failed command: SET FEATURES
[ 16.157525] ata3.00: cmd ef/05:fe:00:00:00/00:00:00:00:00/40 tag 0

[Code].....

I've got a 200GB hard drive, using an ECS SiS 755 A2 motherboard w/1.1b BIOS.

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Jul 14, 2011

Just the last day or so, I've noticed a long pause when I boot my laptop, with lots of disk activity. dmesg says:

[Code]...

Why would there be a 15-second pause (during which the disk is slammed) between mounting root and mounting swap? During this time I see nothing but a blank purple screen, there are no cycling dots or text scroll. Is this normal and I'm just freaking out over nothing because there's no indicator of progress? GRUB default boot options: quiet splash nomodeset video=uvesafb:mode_option=1920x1200-24,mtrr=3,scroll=ywrap vt.handoff=7

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May 23, 2010

I can't get Ubuntu 10.04 to boot for install (to my desktop), it displays the logo then hangs for about a minute and displays the alert dialouge saying "Boot disk error."I've tried multiple CD-Rom drives, burned from multiple computers, with both the desktop and server downloads. I'm down about 10 CDs and 2 DVDs here I've checked their integrity (md5) as well as checked the disk integrity from another computer (laptop) and everything passed. I got xUbuntu to install effortlessly, so I don't know what's causing the problem for Ubuntu. I can even look at the contents of the Ubuntu Server CD from within xUbuntu -- so, I know the disk really should work.

My system specs are pretty basic:

2 x Xeon 2.0Ghz
Tyan S2720 Motherboard
2 Gig (4x512) ECC PC266 RAM

[code]....

why xUbuntu worked and regular Ubuntu won't, and/or maybe what I can do to fix this?

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Jun 17, 2010

I am a long time Windows user and attempting to install Ubuntu Netbook 10 on my Acer Aspire netbook.I followed the steps:1) Downloading the Ubuntu ISO to my netbook hard drive.2) Installed Ubuntu from the netbook HD to USB using USB universal installer (also using the universal installer to format the USB)3) Set bios to first read USB deviceI receive the following message during the boot "Invalid system disk. Replace the disk, and then press any key.I have retried this process several times.

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Nov 20, 2010

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Dec 27, 2010

Downloaded Ubuntu 10.04.1 Desktop AMD64, tried to install it to a cleand HDD using the whole HDD, i.e. gave it permission to use the whole HDD. Installation process appeared to run OK but when it came to the restart it just fired up the message
error: out of disk
grub rescue>

I've searched this forum and found numerous references to these error messages but cannot make head nor tail of the diagnostic suggestions. Apart from anything else they suggest strings of command lines which I don't understand and can't enter anyway since they don't correspond to my keyboard layout (if I hit > or ) something completely different appears on the screen). Is there someone here who can provide a step-by-step solution in lay language? Or is there such a thing as a bootable file which can be downloaded and inserted into my CD drive to correct this problem?

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