Grub Error 21 Ubuntu 10.04
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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 of Ubuntu to an external USB hard drive. During the Ubuntu USB hard drive 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 http://www.techsupportforum.com/forums/f64/solved-how-to-fix-grub-error-21-a-326625.html 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 http://www.pendrivelinux.com/grub-error-21-after-full-install-to-usb-hard-drive/ 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
Install Fail « previous next » Print Pages: [1] Go Down Author Topic: Ubuntu 10.04 Install Fail (Read 5009 times) Erica Newbie Posts: 1 Ubuntu 10.04 Install Fail « on: 2010/05/19, 19:23:37 pm » I just installed Ubuntu http://www.supergrubdisk.org/forum/index.php?topic=510.0 10.04 and now Ubuntu won't reboot.I am getting 'Error 21: Selected disk does not exit.'Any suggested fixes?Thanks! Logged supergrubberx Newbie Posts: 5 Re: Ubuntu 10.04 Install Fail « Reply #1 on: 2010/05/19, 19:55:21 pm » Erica: try reading the wiki articleeasier but riskier = this « Last Edit: 2010/05/19, 20:01:12 pm by supergrubberx » Logged JordanU Administrator Newbie Posts: 43 Re: Ubuntu 10.04 Install Fail « Reply #2 on: 2010/05/19, 21:46:46 pm » Quote from: Erica grub error on 2010/05/19, 19:23:37 pmI just installed Ubuntu 10.04 and now Ubuntu won't reboot.I am getting 'Error 21: Selected disk does not exit.'That is a grub legacy error, which most likely means that you have multiple hard drives and that the hard drive that 10.04 wrote grub to is not the one you are currently booting from.Simplest option: Change the boot order so your other drive is first.Second option: Use Super GRUB2 Disk to boot. Then in the grub error 21 booted system run "sudo dpkg-reconfigure grub-pc" to change the settings for what drives grub should be installed to (don't select any partitions, only whole drives).Third (hard) option: Basically the same as the second but instead of booting with Super GRUB2 Disk you need to chroot in from a LiveCD as explained @ http://grub.enbug.org/Grub2LiveCdInstallGuide . Logged Jon Newbie Posts: 1 Re: Ubuntu 10.04 Install Fail « Reply #3 on: 2010/05/21, 02:13:33 am » Thanks guys - I got called in to help Erica fix her system and we got everything back to normal. In fact better than normal :-)I ended up booting from a LiveCD and using chroot to run the method pointed to by JordanU and everything went flawlessly. I suspect the initial problem might have been caused because her hard drive hangs off a motherboard RAID controller rather than the standard IDE controller... I know Ubuntu 10.04 has some reported hiccups with RAID and upgrades. Erica was upgrading from Ubuntu 8.04 LTS to 10.04 so it was quite a change!We didn't need to use SGD in the end (had been recommended to us by a colleague who'd used it) but I think I can see now where it would have helped me.Thanks all. Logged Print Pages: [1] Go Up « previous next » Forum freezed. Use the mailing list till I unfreeze it » Super Grub(2) Disk