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GRUB Legacy is a multiboot bootloader previously maintained by the GNU Project. It was derived from GRUB, the GRand Unified Bootloader, which was originally designed and implemented by Erich Stefan Boleyn.
Briefly, the bootloader is the first software program that runs when a computer starts. It is responsible for loading and transferring control to the Linux kernel. The kernel, in turn, initializes the rest of the operating system.
- 1 Installation
- 2 Upgrading to GRUB2
- 3 Troubleshooting
- 4 See also
Additionally, GRUB must be installed to the boot sector of a drive or partition to serve as a bootloader. This is covered in the #Bootloader installation section.
Upgrading to GRUB2
Is upgrading necessary?
The short answer is No. GRUB legacy will not be removed from your system and will stay fully functional.
How to upgrade
- FRAMEBUFFER RESOLUTION SETTINGS
- | 640x480 800x600 1024x768 1280x1024
- 256 | 0x301=769 0x303=771 0x305=773 0x307=775
- 32K | 0x310=784 0x313=787 0x316=790 0x319=793
- 64K | 0x311=785 0x314=788 0x317=791 0x31A=794
- 16M | 0x312=786 0x315=789 0x318=792 0x31B=795
- for more details and different resolutions see
/boot/grub/stage1 not read correctly
If you see this error message while trying to set up GRUB, and you are not using a fresh partition table, it is worth checking it.
# fdisk -l /dev/sda
This will show you the partition table for
/dev/sda. So check here, whether the "Id" values of your partitions are correct.
The "System" column will show you the description of the "Id" values.
If your boot partition is marked as being "HPFS/NTFS", for example, then you have to change it to "Linux". To do this, go to fdisk,
# fdisk /dev/sda
change a partition's system id with [t], select you partition number and type in the new system id (Linux = 83). You can also list all available system ids by typing "L" instead of a system id.
If you have changed a partitions system id, you should [v]erify your partition table and then [w]rite it.
Now try to set up GRUB again.
[Here] is the forum post reporting this problem.
Accidental install to a Windows partition
If you accidentally install GRUB to a Windows partition, GRUB will write some information to the boot sector of the partition, erasing the reference to the Windows bootloader. (This is true for NTLDR the bootloader for Windows XP and earlier, unsure about later versions).
To fix this you will need to use the Windows Recovery Console for your Windows release. Because many computer manufacturers do not include this with their product (many choose to use a recovery partition) Microsoft has made them available for download. If you use XP, look at this page to be able to turn the floppy disks to a Recovery CD. Boot the Recovery CD (or enable Windows Recovery mode) and run
fixboot to repair the partition boot sector. After this, you will have to install GRUB again---this time, to the MBR, not to the Windows partition---to boot Linux.
Once you have selected and entry in the boot menu, you can edit it by pressing key Template:Keypress. Use tab-completion if you need to to discover devices then Template:Keypress to exit. Then you can try to boot by pressing Template:Keypress.
If an error is raised mentioning
/boot/grub/device.map during installation or boot, run:
# grub-install --recheck /dev/sda
to force GRUB to recheck the device map, even if it already exists. This may be necessary after resizing partitions or adding/removing drives.
If you have opened a sub-menu with the list of all operating systems configured in GRUB, selected one, and upon restart, you still booted your default OS, then you might want to check if you have the line:
GRUB fails to find or install to any virtio /dev/vd* or other non-BIOS devices
I had trouble installing GRUB while installing Arch Linux in an virtual KVM machine using a virtio device for hard drive. To install GRUB, I figured out the following:
Enter a virtual console by typing Template:Keypress or any other F-key for a free virtual console.
This assumes that your root file system is mounted in the folder
/mnt and the boot file system is either mounted or stored in the folder
1. Assure that all needed GRUB files is present in your boot directory (assuming it is mounted in
/mnt/boot folder), by issuing the command:
# ls /mnt/boot/grub
2. If the
/mnt/boot/grub folder already contains all the needed files, jump to step 3. Otherwise, do the following commands (replacing
your_initrd with the real paths and file names). You should also have the
menu.lst file written to this folder:
# mkdir -p /mnt/boot/grub # if the folder is not yet present # cp -r /boot/grub/stage1 /boot/grub/stage2 /mnt/boot/grub # cp -r your_kernel your_initrd /mnt/boot
3. Start the GRUB shell with the following command:
# grub --device-map=/dev/null
4. Enter the following commands. Replace
(hd0,0) with the correct device and partition corresponding to your setup.
device (hd0) /dev/vda root (hd0,0) setup (hd0) quit
5. If GRUB reports no error messages, then you probably are done. You also need to add appropriate modules to the ramdisk. For more information, please refer to the KVM guide on Preparing an (Arch) Linux guest