Error Grub 21
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install to an external USB hard drive. This person already had Debian Linux installed on their local hard grub error 21 fix drive and was attempting to do an install of Ubuntu to an grub error 15 external USB hard drive. During the Ubuntu USB hard drive installation process, Grub was accidently moved from the internal
Grub Error 5
hard drive to their external hard drive, rendering the original Linux system unbootable without the external drive plugged in. When attempting to boot from the original Debian Linux system, they would encounter http://www.linuxquestions.org/questions/linux-software-2/what-is-grub-loading-error-21-and-how-can-i-fix-the-problem-224475/ the Grub Error 21 shortly after the Grub 1.5 boot process. The good news is that the fix to repair Grub on the original system was quite simple and is illustrated below: Reinstalling or fixing Grub after error 21: Boot into the original Linux system with the external hard drive still installed (or you can boot from a Live Ubuntu CD). Open up http://www.pendrivelinux.com/grub-error-21-after-full-install-to-usb-hard-drive/ a terminal and type sudo su Type fdisk -l and locate your Linux boot partition from the list Example: sda1 or hda1 Type grub-install /dev/sdx or grub-install /dev/hdx to reinstall or repair Grub! Reboot and test! Notes: x represents the drive letter a, b, c, d etc. Replace with your actual drive letter. sdx= SATA, SCSI or USB devices hdx= IDE devices Similar Portable Linux Posts:Pendrivelinux V1 install to a portable USB hard driveInstalling Ubuntu 7.04 to a USB Hard DriveCoLinux Portable Ubuntu for Windows Grub Error 21 after full install to USB hard drive published under Using and Configuring Linux debian linux system, error 21, external hard drive, external usb hard drive, fixing grub, grub, grub install, usb hard drive, USB Ubuntu Portable Linux Categories Flash drive installs using Live CD Flash drive installs using Windows USB Virtual Machine Emulation Using and Configuring Linux Pendrive Linux Posts Make a USB Boot CD for Ubuntu 11.10 Boot DOS from USB - RUFUS LiveUSB Install - Live USB Creator XBOOT - Multiboot ISO USB Creator (Windows) YUMI - Multiboot USB Creator SARDU - Multiboot USB Creator (Windows) B
Today's Posts Advanced Search Find the answer to your Linux question: Entire Site Articles Downloads Forums Linux Hosting Forum Your Distro Red Hat / Fedora Linux [SOLVED] GRUB Error 21 If this is your first visit, http://www.linuxforums.org/forum/red-hat-fedora-linux/162056-solved-grub-error-21-a.html be sure to check out the FAQ by clicking the link above. You may have http://superuser.com/questions/453834/grub-error-21-on-windows-machine to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. ** If you are 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 grub error Jump to page: Results 1 to 10 of 13 Thread: [SOLVED] GRUB Error 21 Thread 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. 03-27-2010 #1 KPolulak View Profile View Forum Posts View Articles Just Joined! Join Date Feb 2009 Posts 42 [SOLVED] GRUB Error 21 Here's the problem: grub error 21 My laptop is running Fedora 12. I installed BackTrack 4 onto an external USB hard drive using a LiveCD. Now when I boot my laptop (external HDD removed), I get this: Code: GRUB Loading stage1.5. GRUB loading, please wait... Error 21 I don't get this. I never touched anything with my internal drive. Well, maybe. When I was reviewing what partitions the installer was going to format, the swap partition for my internal drive (Fedora) was set to be formatted even though I did not specify this. I figured that wouldn't cause any problems. Also, Fedora never used to show GRUB loading at all. Screen was blank until Fedora starting loading. Maybe this means that this is a copy of GRUB from my BackTrack disc? Also, I ran 'fdisk' to look for anything suspicious and under /dev/sda1 (internal drive, boot partition) it says "Partition 1 does not end on cylinder boundary." Please, please help. I have a half-completed research paper on this drive and LOTS of homework and about 70 O'Rielly books. 03-27-2010 #2 devils casper View Profile View Forum Posts Private Message View Articles Super Moderator Join Date Jun 2006 Location Chandigarh, India Posts 24,776 Installer of Backtrack has installed its GRUB in MBR of Internal disk. When you unplug External disk, GRUB couldn't locate its conf files and throws
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Super User Questions Tags Users Badges Unanswered Ask Question _ Super User is a question and answer site for computer enthusiasts and power users. Join them; it only 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 Grub error 21 on windows machine? up vote 1 down vote favorite So for some reason my computer freezes and on restart i get this error (grub loading stage 1.5 grub, loading please wait, error 21) and can't resume to windows. Only way to be able to boot to windows is by a hard reboot. I never had ubunto on my machine and i have searched google for what so ever information i can find but with no luck... Edit: im on windows 7 and i tried with a new fresh install without luck.. this has been going for over a year now. but it happens so rarely that i haven't cared for it, but now im finally tired of this s**t. windows boot grub share|improve this question asked Jul 26 '12 at 12:03 sidiz 62 add a comment| 1 Answer 1 active oldest votes up vote 0 down vote GRUB Error 21 Definition: The boot loader fails when installing Ubuntu from Windows operation system You might encounter Error 21 when you tried to install Ubuntu from Windows or boot Windows after installing Ubunto and the following message appeared: GRUB loading Stage 1.5 Grub loading, please wait.... Error 21. This error may occur because you are trying to boot into windows without the external/original drive attached. System optimization might resolve this problem. Try this tool to optimize your system settings and prevents systems conflicts. Source: http://error21.org/ — this might be an explanation for your error 21. share|improve this answer edited Jul 26 '12 at 15:35 slhck 125k38312360 answered Jul 26 '12 at 12:44 BlueBerry - Vignesh4303 4,393144066 thanks for that information! Think it might be one of the following problems. Software issue - The runtime Error 21 can be caused by a game, software, or a new plug-ins or add-ons that are associated with the program that is generating runtime Error 21, or any runtime Error. Me