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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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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Feb 10, 2011
my laptop doesnt have any cdrom drive and all usbs are broken so wubi is my only option. oh and i use win 7 starter. i tried to install netbook edition to my laptop but i always get error. i can install with only "acpi workarounds". i dont even understand what it is the error and why i'm getting this error.
error is
Quote:
Gave up waiting for root device. Common problems:
-Boot args (cat /proc/cmdline)
-Check rootdelay= (did the system wait long enough?)
-Check root= (did the system wait for the right device?)
-Missing modules (cat /proc/modules; ls /dev)
ALERT! /dev/sda2 does not exist. Dropping to a shell!
BusyBox v.1.15.3 (Ubuntu 1:1.15.3-1ubuntu5) built-in shell (ash) Enter 'help' for a list of built-in commands
(initramfs)
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Feb 14, 2011
I have search and there is similar topic but for 9.10 and the problem contains "UUID" [URL]I was wondering if the fix listed there will help my problem.
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Jun 17, 2010
I have a 64 bit ubuntu 9.10 / 64 bit windows 7 dual boot setup, each installed on different drives.Everything worked fine for weeks, but after booting into windows for maybe the third time, when I tried to boot back into ubuntu, the splash screen and xwindows failed to start, dropping me to a terminal to log in.After rebooting a few more times to see if i could wish the problem away, some kind of fix/recovery screen came up and gave me the chance to try to update/repair installed packages, which I took.Now, when I boot, I get:
ata_id[428]:HDIO_GET_IDENTITY failed for '/dev/.tmp-block-8:80'
ata_id[427]:HDIO_GET_IDENTITY failed for '/dev/.tmp-block-8:64'
usplash: Settomg ,pde 1152x864 failed
[code]....
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Nov 17, 2010
I installed ubuntu netbook 10.10 on my acer aspire one with the "install inside windows" option. The first time it booted into ubuntu properly and completed the installation, then it automatically restarted and now when I try to boot ubuntu, I get the following error message:
Code:
Gave up waiting for root device. Common problems:
- Boot args (cat/proc/cmdline)
- Check rootdelay= (did the system wait long enough?)
- Check root= (did the system wait for the right device?)
- Missing modules(cat/proc/modules; ls/dev)
Alert! /dev/sbd2 does not exist. Dropping to a shell!
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Nov 29, 2010
I was upgrading online through my android phone's easytether app. My phone rang, and I was bounced offline. When I came back the upgrade did not resume, and when I tried to start over, dpkg and whatever was busy so I closed all my windows and tried to reboot. This is where I ended up: Here is a screenshot:
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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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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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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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Oct 16, 2010
Basically, today I installed Ubuntu on my Toshiba NB200 to dual boot with XP. The installation went okay (I think) but after, when I rebooted, and selected Ubuntu from the possible selections, I got this message:Quote:Gave up waiting for root device.Common problems:
-Boot args (cat /proc/cmdline)
-check rootdelay= (did the system wait long enough?)
-check root= (did the system wait for the right device?)
[code]...
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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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Mar 9, 2011
First off I just want to inform you that I've done a lot of research, used countless of hours on Google trying to figure out how to solve this problem I'm having. I'm installing Ubuntu 10.10 64bit with Wubi on the same partition I have Windows 7. And the error I get is the: "Alert! /dev/sdb1 does not exist."
I'm able to get into Ubuntu after waiting a couple of minutes and writing "exit" in the "initramfs".
This is what I've tried:
- Installing without Wubi, still the same problem
- Adding pci=nocrs
- Adding rootdelay=90 in grub.cfg
- Changing the root location to "/dev/sda1"
- Tried using the uuid
[Code]...
"fdisk -l" shows sda1 and sdb1-3. In the boot selection screen Windows seems to be on the "sdb1" as it says "Windows 7 /dev/sdb1", and I thought as I installed Ubuntu through Wubi on the same exact partition that would be the correct root path, but obviously no. Does anyone have any idea what might cause this problem I'm having? Seems like a lot of people got this out there, and this is making me mad!
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Mar 19, 2009
when i add a harddisk to the lenny installation, i cant reboot sucessfully.The disks are all sata, mounted as JBDO, no raid what so ever.They can be used in windows xp x64 (they are ntfs formated)HW setup:
a8n-sli delux
amdx64 cpu
2 gb ram
[code]...
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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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Jul 11, 2011
c@c-laptop:~$ locate /.bashrc
/etc/skel/.bashrc
/home/c/.bashrc
/root/.bashrc
I need to edit /home/c/.bashrc
However when I go to place> Home folders to go to /home/c , the file is not there.
What should I do to make the file appear so that I can edit it?
It is obviously a system file.
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May 6, 2011
I have two machines running SQUEEZE, both installed and configured within the same week (not simultaneously). Both get the users info from a NIS server. In one of the machines (named "corona"), users cannot login, neither locally nor by ssh, in the other one ("xxlager") there is no problem. Both mount the users home directories by NFS. I have not found much useful info in the web. /etc/passwd, /etc/group/, /etc/shadow, are equally configured. The only difference I have found is when I use getent. Using "getent passwd isaenz" on xxlager yields:
isaenz:x:1001:1001:User Name,,,:/home/isaenz:/bin/tcsh
but on corona the result is
isaenz:x:1001:1001:User Name,,,:/home/isaenz:
so the shell info is empty.
Checking /var/log/auth.log I see a message saying:
"User isaenz not allowed because shell does not exist"
But "ypmatch isaenz passwd" returns complete information for isaenz, both on xxlager and corona.
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Feb 25, 2010
As soon as i'm starting to copy a large file enough file (>700Mb) to my ubuntu box (connected to an Asus router via wifi) from a Windows 7 client (connected to router via ethernet cable) i get a dramatic drop in speed. upload starts at 1,0Mb/sec with a ping to ubuntu box at <1ms, and in 2 minutes it drops to 200kb/sec with a ping of over 1000ms! The ping increases with every second in a linear progression.
To exlude router as a possible problem copying to a windows 7 notebook connected to router via wifi results in an average of 2,7Mb/sec with an average ping of 150ms.
MB Model: Asus P5B Deluxe wifi
OS: Ubuntu Server 9.10 + desktop installed
Wifi configured via GUI
2. lsusb
3. wlan0
4. lsmod
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Dec 27, 2010
From one day to the other my system stopped booting properly. Since I (finally) fixed it, I wanted to share my solution. It runs on a fakeraid pair of SSD's of 60 GB each (actually a single Revodrive device, but it shows up as two devices). When Ubuntu 10.10 boots, I'm dropped to a shell.During boot, when I removed "silent splash" from the kernel's command line, I got these messages:
Code:
[ 4.960240] scsi 6:0:0:0: Direct-Access ATA OCZ-REVODRIVE 1.20 PQ: 0 ANSI: 5
[ 4.960425] sd 6:0:0:0: [sdg] 117231408 512-byte logical blocks: (60.0 GB/55.8 GiB)
[cod]....
I doubt that this is what was needed (as I had that already when it didn't work, but I might be required in addition to installing dmraid)
# update-initramfs -a
After installing this, the problem was solved!! This is strange since I don't recall uninstalling this package or changing anything important, for that matter (perhaps did apt-get upgrade, but that's about it!). [URL]
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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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Jul 28, 2010
I have a bit of a dilemma.
I'm using XFCE and it doesn't by default lock the screen before hibernating. I see this as a bit of a security risk, and as I can't hibernate while the screen is locked, I'm a bit lost as to how to achieve this.
I've begun editing /etc/acpi/hibernate.sh, here's what I have so far code...
If I run with sudo, the system hibernates, but gnome-screensaver will not fire. I can verify this by trying "sudo gnome-screensaver-command --lock". The screen goes black, but is not locked. The screen locks properly without sudo.
So the only solution I can see is to edit /etc/acpi/hibernate.sh in such a way that gnome-screensaver-command runs under the current user, and pm-hibernate is called as root.
Also, when I click the HIBERNATE button in XFCE, how does it call pm-hibernate under root without prompting me for a password? I normally wouldn't be interested in such things, but as it seems relevant to my problem I'm a little more eager to learn
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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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Sep 5, 2010
Since the partition of windows7 (C: ) where wubi was installed was too small, I decided to reinstall wubi into another larger partition (E: ), keeping the old root.disk. Sadly when I replaced the root.disk ubuntu cannot boot, the loader says that there is no root.disk file, although it's there... I guess there is some kind of checksum about the virtual disk toward the loader is poiting... So how can I have my old ubuntu installation back?? I still have the old root.disk.
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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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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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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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Mar 9, 2010
I worked everyday during 1.5 years on a Wubi installation of Ubuntu 8.10.
Before quitting my job I have made a simple copy of the root.disk file, thinking I could restore it easily later.
Now I would restore this system on a Virtual Machine (with Virtual Box)
Have you got an idea how i could do this??
(I already tryied to install another wubi on a virtualized Windows 7, the install complete but I can't see ubuntu in the boot loader...)
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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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