Grub Error 27 Unrecognized Command
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Grub Ls Error 27 Unrecognized Command
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Error 8 Kernel Must Be Loaded Before Booting
takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Trouble booting server from GRUB prompt up vote 4 down vote favorite grub legacy commands I just installed CentOS 6.2 on my server but it keeps going to the GRUB prompt. I've never used Grub before but did some digging online. Looks like I have to run the kernel command before I can boot the system. However, the kernel command is not running. As I installed the OS I checked the box that said something like "Install boot loader on /dev/sda". The following is what I've done: grub> find /vmlinuz-2.6.32-220.el6.x86_64 (hd1,0) grub> root (hd1,0) grub> kernel /vmlinuz-2.6.32-220.el6.x86_64 grub list disks root=/dev/sda1 Error 27: Unrecognized command I've tried it with and without the root=/dev/sda1, just /dev/sda, also tried a ro inserted in the middle but nothing works. I've read the docs but at a bit of a loss. Any suggestions? linux centos grub2 share|improve this question edited Dec 27 '13 at 0:39 Braiam 16.9k955100 asked Feb 8 '12 at 22:43 ngramsky 12113 migrated from serverfault.com Feb 8 '12 at 23:17 This question came from our site for system and network administrators. I suggest writing a real question... not "any suggestions?" –Chris S Feb 8 '12 at 23:18 The question is 'How to boot the server', as noted in the title. I've had my questions downgraded in the past for not showing what I have tried thus far. I'm trying to boot the server and have attempted to do so with the following approach... –ngramsky Feb 9 '12 at 0:13 add a comment| 3 Answers 3 active oldest votes up vote 1 down vote Your missing commands, which is the main reason your having this problem. I also recommend entering your commands from the edit screen, and then booting with CTRL-X here is an example, I would assume you will have to change things to fit your installation. root (hd1,0) kernel /vmlinuz-2.6.18-92.1.22.el5 ro root=LABEL=/ initrd /initrd-2.6.18-92.1.22.el5.img If this doesn't point you in the right direction, or you have another error message, comment under this and I will help more in depth. Al
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logged in, most ads will not be displayed. ** Linuxforums now supports the Tapatalk app for your mobile device. Page 1 of 2 1 2 Last Jump to page: Results 1 to 10 of 12 Thread: grub repair Thread http://unix.stackexchange.com/questions/31226/trouble-booting-server-from-grub-prompt Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Enjoy an ad free experience by logging in. Not a member yet? Register. 04-16-2007 #1 R3N3G4D3 View Profile View Forum Posts Private Message View Articles Just Joined! Join Date Apr 2007 Posts 12 grub repair I have Windows and Ubuntu installed on my laptop as dualboot. The way the partition table was setup is: hda1 = Windows http://www.linuxforums.org/forum/ubuntu-linux/91700-grub-repair.html XP (primary) hda2 = Unused (primary) hda3 = Extended hda5 = Ubuntu / (Logical inside hda3) hda6 = Ubuntu swap (Logical inside hda3) hda7 = NTFS storage partition (Logical inside hda3) Everything was working fine, until Windows corrupted itself. After reinstalling Windows, it got rid of grub MBR, so now only Windows can boot up. I've looked at several fixes online, but none seem to work for me. Here is what I tried and results I got: 1.) With Gentoo CD tried "mkdir dummydir", "mount /dev/hda3 dummydir", after this I went into dummydir and it did indeed contain the stuff from hda5 (Ubuntu root directory) (also, mounting /dev/hda5 gives an error saying that I need to specify partition type, using -t ext3 says that it's a logical partition and I want to mount extended one instead, which is why I mounted /dev/hda3). After this I tried "chroot dummydir", which changed me to root@livecd. And then I tried using "grub-install /dev/hda" which gave me and error: "/dev/hda: Not found or not a block device. So then instead of that I launched grub and tried "root (hd0, 4)" (since that should correspond to /dev/hda5, also (hd0, 4) is what /boot/grub/menu.lst claims as my Ubuntu partition), however, that command gave me "Error 21: Selected disk does not exist" error in grub. 2.) Burned Fedora Core rescue cd, tried "linux rescue" command. After a few prompts i
Common F23 Bugs Common F24 Bugs Communicate with Fedora The Documents Bug Reports Fedora Update System (Bodhi) Fedora Build System (Koji) Official Spins FedoraForum.org > Fedora 23/24 > Using Fedora Error 27: unrecognised command FedoraForum Search http://forums.fedoraforum.org/showthread.php?t=217059 User Name Remember Me? Password Forgot Password? Join Us! Register All Albums FAQ Today's Posts Search Using Fedora General support for current versions. Ask questions about Fedora that do not belong in any other forum. Google™ https://bugzilla.redhat.com/show_bug.cgi?id=64950 Search FedoraForum Search Red Hat Bugzilla Search Search Forums Show Threads Show Posts Tag Search Advanced Search Go to Page... Thread Tools Search this Thread Display Modes #1 16th March 2009, 05:49 error 27 PM wizza Offline Registered User Join Date: Mar 2009 Posts: 14 Error 27: unrecognized command Hi peeps, I have just come across the above error code when trying to boot into vista. Up until now it has always worked. cant think of anything i have done to make it do this (its got to be me though right?) Has anyone got any ideas PLEASE!! cheers Mark Last edited by wizza; 16th March error 27 unrecognized 2009 at 06:04 PM. wizza View Public Profile Find all posts by wizza #2 16th March 2009, 06:02 PM wizza Offline Registered User Join Date: Mar 2009 Posts: 14 just did a quick test just now. if i change the boot order in the bios for my 'c' drive (sata) to go first vista boots. (fedora is on ide slave) (still getting the problem booting from grub though) Last edited by wizza; 16th March 2009 at 06:07 PM. wizza View Public Profile Find all posts by wizza #3 16th March 2009, 06:06 PM vwbond Offline Registered User Join Date: Mar 2009 Posts: 22 Good job, man. __________________ We close Windows to keep virus out. CentOS 6 (Gnome) running on an old Dell D630 T7250 2Ghz CPU, 3GB DDR MB, Dual booting Win 7 64bit with CentOS 6. Reason for moving to Linux: In Jan 07 Windows Vista was released to the public (in beta form) and the time spent with BSOD errors and system freezes was over the top. Windows finally drove me to find an OS that had more stability. vwbond View Public Profile Find all posts by vwbond #4 16th March 2009, 06:12 PM wizza Offline Registered User Join Date: Mar 2009 Posts: 14 this is my grub.conf
Format For Printing -XML -Clone This Bug -Last Comment First Last Prev Next This bug is not in your last search results. Bug64950 - Pressing `e' may give "Error 27: Unrecognized command" Summary: Pressing `e' may give "Error 27: Unrecognized command" Status: CLOSED NOTABUG Aliases: None Product: Red Hat Linux Classification: Retired Component: grub (Show other bugs) Sub Component: --- Version: 7.3 Hardware: i686 Linux Priority low Severity low TargetMilestone: --- TargetRelease: --- Assigned To: Jeremy Katz QA Contact: Docs Contact: URL: Whiteboard: Keywords: Depends On: Blocks: Show dependency tree /graph Reported: 2002-05-14 20:04 EDT by Need Real Name Modified: 2008-05-01 11:38 EDT (History) CC List: 0 users See Also: Fixed In Version: Doc Type: Bug Fix Doc Text: Story Points: --- Clone Of: Environment: Last Closed: 2002-05-15 17:52:59 EDT Type: --- Regression: --- Mount Type: --- Documentation: --- CRM: Verified Versions: Category: --- oVirt Team: --- RHEL 7.3 requirements from Atomic Host: Cloudforms Team: --- Attachments (Terms of Use) Add an attachment (proposed patch, testcase, etc.) Groups: None (edit) Description Need Real Name 2002-05-14 20:04:33 EDT Description of Problem: * Pressing `e' in grub boot screen sometimes gives the following error: ------------------------------ Booting command-list S Error 27: Unrecognized command Press any key to continue... ------------------------------ * Then things work fine Version-Release number of selected component (if applicable): * grub-0.91-4.src.rpm How Reproducible: * Press `e' in grub Steps to Reproduce: 1. Use grub as the boot loader 2. Boot the machine 3. On the grub boot screen, press "e" to edit the entry 4. This will cause the error about 1/3 of the time Actual Results: * Error 27: Unrecognized command Expected Results: * Perfection Additional Information: Comment 1 Jeremy Katz 2002-05-15 17:52:53 EDT I haven't seen this one at all on any of my hardware. What sort of hardware is this on? Also, is it on the edit the boot entry or to edit the command line for the boot entry? Comment 2 Jeremy Katz 2002-09-20 16:39:03 EDT Closing due to inactivity Note You need to log in before you can comment on or make change