Grub Error 21 Usb
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install to an external USB hard drive. This person already had Debian Linux installed on their local hard drive and was attempting to do an install
Grub Error 21 Selected Disk Does Not Exist
of Ubuntu to an external USB hard drive. During the Ubuntu USB hard drive error 21 selected disk does not exist windows 7 installation process, Grub was accidently moved from the internal 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 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 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) Boot Multiple ISO from USB via Grub2 using Linux Creating a Kubuntu Live USB from CD Creating an Xubuntu Live USB from CD Creating an Ubuntu Live USB from CD Using UNetbootin to create a Linux USB from Linux MultiSystem - Create a MultiBoot USB from Linux Put Mandriva
Help » General » (SOLVED) Got "Error 21" message when in GRUB « previous next » Print Pages: [1] 2 3 4 5 Go Down Author Topic: (SOLVED) Got "Error 21" message when in GRUB (Read 12974 times) batzilla Full Member Posts: 104 (SOLVED) Got "Error 21" message when in GRUB « on: September 04, 2012, 01:56:57 PM » I was on my computer, minding my own business, and the tool bar at the bottom of the page went away and I was stuck. So I manually shut down my computer and on booting again, got a black screen with this message:GRUB Loading stage1.5.GRUB Loading, please wait. . . .Error 21Can somebody rescue me!? I'm running PCLinuxOS http://www.pendrivelinux.com/grub-error-21-after-full-install-to-usb-hard-drive/ 2009 release 2.6.26.8.tex3 with KDE 3.5.10 on a Dell Dimension 4500.Batzilla « Last Edit: September 13, 2012, 08:34:16 PM by batzilla » Logged BatzillaDell Dimension 4500PCLinuxOS 2012.08-KDERelease 3.2.18-pclos2.bfsKDE 4.8.3 i14 PCLinuxOS Tester Super Villain Posts: 23815 MLUs Forever! Re: Got "Error 21" message when in GRUB « Reply #1 on: September 04, 2012, 02:32:13 PM » Quote21 : Selected disk does not exist This error is returned if the device part of a device- or full http://www.pclinuxos.com/forum/index.php?topic=108824.0 file name refers to a disk or BIOS device that is not present or not recognized by the BIOS in the system.From info:/grub/Stage2 errors ..... you can use Konqueror to see all the error messages by entering that in the location bar.I would suggest checking the cables .... power and data going to the disk ..... pull them and reseat them with the power unplugged.Then try to boot again. Logged "Posterity - a paultry form of eternity" L. CohenKernel: 4.8.1-pclos1 x86_64 (64 bit); Desktop: KDE 4.14.18; Mobo: ASUSTeK P8Z68-V PRO v: Rev 1.0.1; CPU: Quad core Intel Core i7-3770S (-MCP-) cache: 8 MB; Memory: 8 GB; CPU Speed max: 3900 MHz; Graphics Card: Intel Xeon E3-1200 v2/3rd; SONY DVD RW T6 Guest Re: Got "Error 21" message when in GRUB « Reply #2 on: September 04, 2012, 02:36:39 PM » you are using a really old version of pclinux! any reason to do that?error 21, wasn't that error related to the hard disk partitions? backup your important files just in case that partition or hard disk are failingsupposedly you can fix this error by running the redombr tool to recreate the mbr file or restore it but i don't remember if this tool exist in the livecd of 2009 or we have that tool since 2010 Logged Old-Polack Administrator Super Villain Posts: 16418 ----IOFLU---- Re: Got "Error 21
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 http://unix.stackexchange.com/questions/4690/grub-error-21-unless-both-sd-card-and-live-usb-are-present Business Learn more about hiring developers or posting ads with us Unix & Linux Questions Tags Users Badges Unanswered Ask Question _ Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. 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 error 21 unless both sd card and live-usb are present up vote 4 down vote favorite I'm not sure exactly how my EEE PC got to this point, but I have Backtrack (an Ubuntu-based distro) on the SD card, and a few different Ubuntu LiveUSB distros on different USB memory sticks. If both the SD card and any of the USB sticks are present, the system will present a GRUB boot menu which seems to be grub error 21 the built-in EEE PC one--it has the "reset to factory defaults" option--but all options will boot Backtrack, even after claiming to reset to factory defaults. If either the USB stick, the SD card, or both are missing, I get a Grub error 21 at boot. Not sure quite how to un-hose this; I'd just like to put a conventional netbook Ubuntu on the built-in SSD, but I can't trivially do that from Backtrack 4. ubuntu laptop grub-legacy share|improve this question edited Dec 27 '13 at 1:06 hildred 3,68811233 asked Dec 9 '10 at 16:24 user3019 1212 Is there a BIOS setting to control boot order? Fiddling with it might solve your problem. Otherwise try running grub-install, perhaps after writing the device map (I don't know what would work offhand). Boot Info Script may help your diagnosis, more about it. –Gilles Dec 9 '10 at 19:29 I have tried all possible boot order variations in the BIOS; none affects the error 21 outcome. The device map should only be relevant to legacy systems, but that boot info script may be useful, thanks. –user3019 Dec 9 '10 at 19:33 add a comment| 1 Answer 1 active oldest votes up vote 1 down vote It's a wrong setup of GRUB. Reinstall it on ssd, using uuids for booting from SD and you'll be ok. I recommend