Ubuntu Installation :: Boot Fails: Can't Find Root Device + Drop To Shell
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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Jun 20, 2011
I've installed squeeze and wheezy on an old Toshiba Satellite 210 CS laptop with 48MB RAM and a 20GB IDE harddrive.Grub2 won't boot at all and stops with a "error: cannot allocate real mode pages". The solution to that is to use the grub-legacy package.The boot then fails with "waiting for root device" and drops to an initramfs shell.
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Mar 17, 2011
I just compiled my first own kernel (I'm using Arch Linux), following the tutorial on the german site. Now I tried to boot it, I ended up failing with this message: Code: Waiting 10 seconds for device /dev/sda1 ... Root device '/dev/sda1' doesn't exist, Attempting to create it. ERROR: Unable to determine major/minor number of root device '/dev/sda1' Here is the important part of my menu.lst:
[Code]....
I simply copy&pasted the Arch-entry, i.e. I also had the disk by uuid there. The failure message was the same, just the root device name was the different name Also, at first I did not have the initrd line in my menu.lst (as written in my tutorial that I may not need it). In this case I had this error message:
[Code]....
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Oct 31, 2010
We have a SuSE/SLES 9 server that boots from a fibre channel card, using volumes from a NetApp filer.
We previously had the server booting from the LUNs on the filer, but after some tinkering around with the fibre channel BIOS, we have the situation where the LUNS seem to be mounted, the OS boots, starts to initialise everything but then stalls, saying:
We have tried loads of combinations of settings in the BIOS and fibre channel BIOS without any success or any idea what may have caused the error.
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Oct 23, 2010
I have a laptop IBM R50e. A clean install using 10.04.1 has been done, and all updates have been loaded. At boot, the system does not start the desktop. It tries and drops into the shell. I have started the recovery boot, and tried failsafeX start, but it only returns into the shell.
The boot parameter i915.modeset=1 has been set. There are a number of issues with the Intel graphics card and 10.04, I have been through those without success.
The modeset makes it possible to start some graphical environmrnt using xinit or startx. startx starts gnome, but lot of functionality is missing, like the network applet. Additionally I notice that there is no file /var/run/dbus/system_bus_socket, which my other laptop has when in gnome.
Started gdm when being in the graphical shell through xinit, gives the error message that /var/run/dbus/system_bus_socket is missing.
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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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Oct 7, 2010
I am dealing with a problem which I cannot seem to fix myself.I have a computer (age ~1 year) on which I am trying to install Ubuntu.The problem which I am facing is at the point of choosing to boot from the CD it says 'cannot find bootable device'.Note that this PC does not have a floppy drive and that I do not have a 1GB USB stick. I do have a 256MB USB stick.
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May 20, 2010
I have installed Fedora 12 on my HP laptop which has got a NVIDIA graphics card. I have got latest F12 kernel 2.6.32 as well as default kernel 2.6.31.I have installed Nvidia Proprietary Drivers and modified grub.conf file for 2.6.32 kernel saying blacklist nouvaue so that it can load NVIDIA drivers ...After that I am able to successfully boot into 2.6.32 kernel with Nvidia Proprietary Drivers.Everything seems to be fine .. But suddenly today when I tried to boot into F12 2.6.32 kernel I got the following error
Code:
No Root Device Found
Boot Failed, Sleeping Forever
[code]...
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Nov 30, 2010
just installed ubuntu 10.10 on my external usb hdd from my 8gb flash drive doing this on a laptop, my primary hdd (internal) is running windows (230gb of 250gb used) so i got an external hdd (2tb) and I decided to install ubuntu on it
[Code]....
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Jun 1, 2010
I'm a long time Linux user. Finally got around to upgrading my Fedora 11 system to Fedora 12 by using the 'preupgrade' tool. The upgrade appeared to go well (downloaded packages, rebooted into installer, etc). However, now that the upgrade is complete, I'm unable to boot my system.
Here's my configuration:
/dev/sda (80Gb)
200Mb /boot partition (ext3)
52Gb / partition (ext4 - managed as logical volume)
2Gb swap partition (managed as logical volume)
20Gb /spare partition (ext3 - managed as logical volume) .....
All worked fine under Fedora 11 for the last few months. Grub now presents me with 'Fedora' and 'Windows XP' boot options. The /boot/grub/menu.lst file is essentially the same as it was for Fedora 11, except for the different kernel versions, etc. The boot sequence shows the Fedora bubble (??) and gets about 80% full when the screen goes black and the message displayed is:
No root device found
Boot has failed, sleeping forever
If I boot Windows, all works fine.
Am able to boot using a SystemRescueCD disk. The disks all look okay and I can mount/modify all partitions, etc. The grub menu.lst file read as follows (sorry, typed in, not copied):
default=0
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.32.11-99.fc12.i686.PAE)
root (hd0,0) .....
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Nov 21, 2010
I have 2 Debian OS's and wanted to put Fedora next to it.
Install went ok, but after rebooting it says: "No root device found. Boot has failed, sleeping forever."
During install from the live CD I didn't "v" the boot (efi or something?) because I thought Grub would take care of everything.
Should I just reinstall again and choose the Fedora bootloader? Won't it mess up Grub?
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May 19, 2011
I have a usb to serial converter which i plug in to Ubuntu Natty.I see that on every reboot this seems to come up as a different device name, say ttyUSB0, ttyUSB3 etc.I want to write a simple shell script to get the name of the device in a shellscript.
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Feb 8, 2011
I downloaded fedora 14 64 image then created a bootable flash drive and put the image on the flash drive. I rebooted and tried booting from the flash drive and that's the message I received. What do I do?
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Sep 12, 2014
I installed Debian Jessie (netinst, daily snapshot) on my Acer Aspire V5-123 laptop in the UEFI mode with the secure boot turned off. everything (network, hardware, partitioning, ...) went smoothly to the last step, but after removing the boot media (USB stick) and rebooting, the firmware could not find the boot device ! The only thing I can think of, is that the EFI boot is not set up properly by Debian installer, but I don't know how to fix it.
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Jul 11, 2010
When I boot off of Debian Kernel 2.6.26-2-686. This is what happens. It stops at attached scsi generic sg5 type 0 After 4 or 5 minutes it comes back and says.
Gave up waiting for root device. Common problems Boot args (cat /proc/cmdline) Check Root= (did the system wait for the right device) Missing modules (cat /proc/modules; ls /dev Alert /dev/sdd8 does not exist dropping to shell /bin /sh: can't access tty; job control turned off If I boot off Debian Kernel 2.6.26-2-686 (single user mode) Then use Control-D it boots fine.
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May 3, 2010
I was upgrading our lab's dhcp server to Lucid and it totally died. I have it running on a Debian recovery cd right now. I ran into a bug in gtk which I seem to have fixed, but now I have more serious errors. If I boot without a CD, I get dumped into a busybox shell after the machine fails to boot. From the live CD, I tried dist-upgrading again and it dies trying to build and install rsyslog with a broken pipe error. I am at a loss as to what to do from here short of reinstalling (which is the last option as this server has a lot of custom configs on it)
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Jan 17, 2011
out in finding root device of fedora 14. I've windows XP and fedora 14 installed on. this is the output for blkid
/dev/sda1: UUID="962C8EA82C8E834B" TYPE="ntfs"
/dev/sda5: UUID="262C06BF2C068A4F" TYPE="ntfs"
/dev/sda6: UUID="cbcf539a-dee1-4f2f-b68c-ce315ae76e0f" TYPE="ext4"
[code]...
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Jul 23, 2011
I have a raid array using mdadm made up of two drives. The drives have two parts, the first for boot information and the 2nd for LVM. Everything but /boot is under LVM management. Originly the two drives were hooked up to a sata controller in a computer with no on-board sata. However I was not able to get the computer to boot to a sata drive off of that controller. So there was an IDE drive with the MBR that loaded grub.
Now the computer in that setup seems to have died. So the drives were moved to another computer with an on-board sata controller and now the bootup works as far as getting to the grub menu. However after the grub menu the error message "Cannot find root device"
I found the boot info script [URL].. note at the time that was run the computer was running with one drive that has a full Debian install with the raid drive in question mounted and chrooted into. The script was ran from the chroot envirment.[URL]..
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Mar 19, 2011
I've installed Fedora 15 with Fedora 14 already installed in other partitions, but now I can't boot Fedora 14 as it prompts "no root device found", these are both grub.confQuote:
#boot=/dev/sda
default=0
timeout=120
[code]...
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Mar 30, 2011
New install, linux Fedora 15 Alpha. I am trying to switch over to Fedaora, but the bleeping thing keeps saying device/error/cant find the root.
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Aug 10, 2011
Is there a non-root shell command that can tell me if a user's account is disabled or not? note that there is a fine distinction between LOCKING and DISABLED:
LOCKING is where you prepend ! or * or !! to the password field of the /etc/passwd file. On Linux systems that shadow the passwords, this marker flag may be placed in /etc/shadow instead of /etc/passwd. Password locking can be done (at a shell prompt) via password -l username (as root) to lock the account of username, and the use of the option -u will unlock it.
DISABLING an account is done by setting the expiration time of the user account to some point in the past. This can be done with chage -E 0 username, which sets the expiration date to 0 days after the Unix epoch. Setting it to -1 will disable the use of the expiration date.
The effect of locking to to prevent the login process from using a supplied password to hash correctly against the saved hash (by virtue of the fact that the pre-pended marker character(s) are not valid output character(s) for the hash, thus no possible input can ever be used to generate a hash that would match it). The effect of disabling is to prevent any process from using an account because the expiration date of the account has already passed.For my situation, the use of locking is not sufficient because a user might still be able to login, e.g. using ssh authentication tokens, and processes under that user can still spawn other processes. Thus, we have accounts that are enabled or disabled, not just locked. We already know how to disable and enable the account - it requires root access and the use of chage, as shown above.To repeat my question: is there a shell command which can be run without root privileges which can output the status of this account expiration info for a given user? this is intended for use on a Red Hat Enterprise 5.4 system.The output is being returned to a java process which can then parse the output as needed, or make use of the return 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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Mar 9, 2010
I tried to create a user on Solaris 10 but when I try to login the user with "su -" I get the error message "no directory". When I try to login with "su" I get the error message "no shell".
I tried the useradd several combinations e.g.
All the tries i made didn't work. I also checked the permissions on /etc, /bin, /sbin and / and it seems ok so that the newly created user can access them.
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Jul 20, 2009
The server comes up after rebooting and after setting the hostname it starts setting up logical volume management. It says that 2 logical volume(s) in volume group "VolGroupOO" now active But then it starts to check the file system and errors with fsck.ext3: Device or resource busy while trying to open /dev/sdb1 [failed]
***An error occured during the file system check
***Droppping you to a shell, the system will reboot when you leave the shell
Give root password for maintenace
After I log in with the root I get the message mesg: error tty device is not owned by group 'tty' Can the forum tell me how to troubleshoot this issue so I can boot back up again? I have 2 harddrives in this server and only 1 drive was detected when I first installed CentOS. The error first appeared when I mounted the 2nd drive at the mount point /UserGeneratedData. drive was formatted with ext3 before mounting and did not have any data on it I don't want any software RAID if thats what seems to be going on with "VolGroup00"
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Jul 28, 2011
I recently came into (temp) possession of two Original, white, 700 MHz eMacs. I have only started to play on one of these so far. Installed Ubuntu 10.04 PPC from Alternate Install CD - two times actually (because I thought I may have screwed something up the first time), but both times it seemed to go without a hitch.
After install and restart, I cannot drop into a shell, all I get is the black screen. I'm probably forgetting something really obvious, but I've tried Holding "Shift" and "F1" and control+alt+F1 (and F2, F3, F4, F5, F6), tried the esc key; with two different Apple USB keyboards. I'm really just wanting to load an xorg.conf file and reboot.
Should I have been trying to do this just after install, but before restarting? I can get into Open Firmware just fine, but have no idea what I'd do from OF except start off the CD again. I should mention I installed Debian just fine and am pretty confident MintPPC would work flawlessly, but I am trying to get Ubuntu 10.04 on here.
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Nov 29, 2008
I have a flash drive that I want to mount as my root filesystem at boot time. When I'm in linux, I can run `mount /dev/sda1 /mnt`, and the kernel will mount the ext3 FS on the flash drive at /mnt with no problems. From this I assumed I could boot my system with the kernel option 'root=/dev/sda1', but this doesn't work. My kernel has no initrd, and is booted directly by a bootloader. It has no modules, so I know that's not the issue.
The current setup that works consists of a ramdisk that the bootloader loads into RAM before booting the kernel. The kernel detects this ramdisk and the current kernel root option ('root=/dev/ram') mounts the ramdisk as the root fs with no problems.I can see where the kernel detects the flash driveat startup, and I can't think of a reason why I couldn't just mount it as root. I can copy/paste startup logs here if necessary.
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Apr 24, 2011
I am trying to install Ubuntu 10.10 from a USB flash memory stick. It works fine until around 95%, where I get the following warning/error:
[Code]....
I click OK and the installer seems to finish nicely, except the terminal throws several errors along these lines (see photo):
[Code]....
I tried also with 10.04 LTS, the difference being that the install warning appears two or three times instead of once. Some results from googling (Ubuntu Forums, Ubiquity bug) suggest unchecking the initial update options. I am going to try this but I'm not sure if I'll be able to get the boot loader right (there seemed to be problems with this).
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Sep 6, 2010
I switched to the linux-image-rt kernel a while back, and decided yesterday to switch back to linux-image-generic. Unfortunately, I couldn't remember how to do this properly, so I just uninstalled all of the linux-rt related packages and then changed the /vmlinuz and /initrd.img symbolic links back to what they used to be and rebooted. So now the machine gets stuck in a memtest whenever I boot from the HD. I'm having trouble figuring out how to fix things from a rescue CD. If I try chroot /mnt/hd (where my old system was), and then update-grub, for example, I get: /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?). So, basically I'm completely lost, but also sure that a working system isn't more than a few simple commands away. Can anyone throw me a bone?
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Oct 21, 2010
I have been trialling Slack 13.1 on a spare 32b system for a couple of weeks, and today I took the plunge and put it on my main machine. I completely re-partitioned the drive (using the Slack disk) and installed Windows7 on one partition and Slack 13.1 on another. The install worked fine and I tested that it boots from LILO into both Windows and Slack perfectly. I then ran:
slackpkg update
slackpkg install-new
slackpkg upgrade-all
And since then it fails to boot with the following:
Code:
VFS: Cannot open root device "802" or unknown block(8,2)
Please append a correct "root=" boot option; here are the available partitions:
0840 488386584 sde driver: sd
0841 97659103 sde1
0842 19535040 sde2
0843 498015 sde3
[Code]....
I have seen many, many similar problems when searching Google but they all seem to be caused by different things.
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Jun 21, 2010
ubuntu 9.10 is not booting shows Gave up waiting for root device.", (initramfs). how to boot normally from this problem. The problem is coming from installed system.
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