What are the grub rescue commands?

What are the grub rescue commands?

GRUB Rescue Commands

How do I use GRUB2?

Using the GRUB2 boot prompt

1. Load the XFS and LVM modules.
2. List the drives which GRUB2 sees:
3. Examine the output to understand the partition table of the /dev/sda device.
4. Probe each partition of the drive and locate your vmlinuz and initramfs files.
5. Set the root partition.
6. Set the desired kernel.
7. Set the desired initrd .

How do I change GRUB2 boot menu?

Navigate to the file /boot/grub/grub.

Then double-click grub. cfg to open the file in a text editor. In the file you will find the line ( set default=”0″ ). Edit the 0 to the line number in Grub that you want to load.

How do I start the grub server from command line?

Booting From grub>
The first line sets the partition that the root filesystem is on. The second line tells GRUB the location of the kernel you want to use. Start typing /boot/vmli , and then use tab-completion to fill in the rest. Type root=/dev/sdX to set the location of the root filesystem.

How do I fix corrupted Grub in Linux?

The solution

1. To fix the problem execute from grub command line:
2. Restore boot partition on hd0,0 (first partition on first disk) as in above example from find command.
3. Then setup grub on first disk (hd0) – as in above example boot stage1 is located on hd0.
4. After command will succeed reboot the server.

How do I restore grub?

Resolution

1. Place your SLES/SLED 10 CD 1 or DVD in the drive and boot up to the CD or DVD.
2. Enter the command “fdisk -l”.
3. Enter the command “mount /dev/sda2 /mnt”.
4. Enter the command “grub-install –root-directory=/mnt /dev/sda”.
5. Once this command completes successfully reboot your system by entering the command “reboot”.

How do I customize grub boot menu?

To change the Grub boot menu background through the terminal:

1. Copy the path to the image file.
2. Open the grub. cfg file located in /etc/default.
3. Append the following line to the file.
4. Save the file and close the editor.
5. Update Grub with the new configuration file.

How do I edit grub config?

To edit grub, make your changes to /etc/default/grub . Then run sudo update-grub . The update-grub will make the permanent changes to your grub. cfg file.

What is Grub_hidden_timeout?

GRUB_HIDDEN_TIMEOUT=0
No menu is displayed. The system is immediately booted to the default OS. This is the default setting with only one identified operating system.

How do I use GRUB boot menu?

You can get GRUB to show the menu even if the default GRUB_HIDDEN_TIMEOUT=0 setting is in effect:

1. If your computer uses BIOS for booting, then hold down the Shift key while GRUB is loading to get the boot menu.
2. If your computer uses UEFI for booting, press Esc several times while GRUB is loading to get the boot menu.

How do I restart GRUB?

grub is a bootloader so it is only concerned with what OS you want to boot. during the grub menu, you probably do have a de facto “restart” available via CTRL+ALT+DELETE or your hardware reset button.

How do I load a kernel in GRUB?

GNU/Linux

1. Set GRUB’s root device to the same drive as GNU/Linux’s. Probably the command find /vmlinuz or similar can help you (see find).
2. Load the kernel: grub> kernel /vmlinuz root=/dev/hda1.
3. If you use an initrd, execute the command initrd (see initrd) after kernel :
4. Finally, run the command boot (see boot).

How do I recover a grub file?

How do I fix corrupted grub in Linux?

How do I restore a missing GRUB bootloader?

Steps to recover deleted GRUB bootloader in Linux:

1. Boot into Linux using Live CD or USB Drive.
2. Get into Live CD mode if available.
3. Launch Terminal.
4. Find Linux partition with working GRUB configuration.
5. Create temporary directory to mount Linux partition.
6. Mount Linux partition to the newly created temporary directory.

How do I change GRUB bootloader?

1. 1.1. Select default OS (GRUB_DEFAULT) Open /etc/default/grub file using any text editor, for example nano.
2. 1.2. Set OS timeout (GRUB_TIMEOUT) By default, the selected entry from the boot menu will start to boot in 10 seconds.
3. 1.3. Change GRUB background image.

How do I change grub settings?

How do I remove GRUB bootloader from BIOS?

Just press f12 when booting screen appears, then go to BIOS. On that page at the bottom you will see an option of reset . Reset it and remove GNU boot loader.

How do I enable GRUB bootloader?

Method 1: Move Grub up the order

1. Quickly press F2, F10 or F12 keys at the screen showing your system manufacturer’s logo.
2. Make sure that Ubuntu is above Windows in the boot order.
3. Add new boot option.
4. Browse to EFI file.
5. Select EFI directory.
6. Select Debian.
7. Select shim.efi.
8. Adding the new boot option with efi file.

How do I change GRUB boot options?

Use the arrow keys to select the boot entry to edit, then type e to access the GRUB edit menu. Use the arrow keys to select the kernel or kernel$ line in this menu. Type e to add boot arguments to the line. Type any additional boot arguments that you want to specify.

How do I fix grub rescue error?

How To Fix: error: no such partition grub rescue

1. Step 1: Know you root partition. Boot from live CD, DVD or USB drive.
2. Step 2: Mount the root partition.
3. Step 3: Be the CHROOT.
4. Step 4: Purge Grub 2 packages.
5. Step 5: Re-install Grub packages.
6. Step 6: Unmount the partition:

What is GRUB Linux?

(GRand Unified Bootloader) A program that calls a Unix/Linux operating system into memory. Officially GNU GRUB, GRUB is a popular boot loader due to its flexibility and configuration capabilities, allowing changes to be made at boot time and support for boot images from the network.

How do I load a kernel module?

Loading a Module

1. To load a kernel module, run modprobe module_name as root .
2. By default, modprobe attempts to load the module from /lib/modules/kernel_version/kernel/drivers/ .
3. Some modules have dependencies, which are other kernel modules that must be loaded before the module in question can be loaded.

What is the kernel command line?

Kernel command line parameters are parameters that you pass on to the Fatdog64 during the boot process. They are also known as “boot options”. Some of these parameters are understood by the Linux kernel, some are understood by Fatdog64 system scripts.

How do I fix a corrupted grub?