How do I reinstall GRUB bootloader?

  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 install GRUB?

In order to install GRUB under a UNIX-like OS (such as GNU), invoke the program grub-install (see Invoking grub-install) as the superuser (root). This install doesn’t conflict with standard install as long as they are in separate directories.

Where is Grub bootloader installed?

The GRUB 2 files will normally be located in the /boot/grub and /etc/grub. d folders and the /etc/default/grub file in the partition containing the Ubuntu installation. If another Ubuntu/Linux distribution controlled the boot process, it will be replaced by the GRUB 2 settings in the new installation.

Do you want to install bootloader GRUB?

You don’t actually need GRUB (Grand Unified Boot Loader) boot loader as it is by default boot loader and manager for Ubuntu since version 9.10. If you look into the booting process, after BIOS and MBR, GRUB gives you the option of choosing your kernel.

What is GRUB-install in Linux?

What is GRUB in Linux?
  1. GRUB Features. GRUB is the default bootloader for many of the Linux distributions. …
  2. GRUB Installation Process. GRUB automatically becomes the default loader after it is installed. …
  3. GRUB Boot Process. The boot process using GRUB requires the GRUB to load itself into memory. …
  4. GRUB Interfaces.

Where is GRUB file in Linux?

The GRUB menu interface configuration file is /boot/grub/grub. conf. The commands to set the global preferences for the menu interface are placed at the top of the file, followed by stanzas for each operating kernel or operating system listed in the menu.

Does Linux need GRUB?

The UEFI firmware (“BIOS”) can load the kernel, and the kernel can set itself up in memory and start running. The firmware also contains a boot manager, but you can install an alternative simple boot manager like systemd-boot. In short: there is simply no need for GRUB on a modern system.

How do I know if GRUB is installed?

The output of the dd command has the word “GRUB” in it. That tells you grub is installed on the device. For the rest of the connection look into how computers, storage devices and bootloaders interact.

What is GRUB Linux?

GRUB stands for GRand Unified Bootloader. Its function is to take over from BIOS at boot time, load itself, load the Linux kernel into memory, and then turn over execution to the kernel.

Can I install Ubuntu without GRUB?

Installing GRUB is the usually the best way to go, whether or not you’re dual-booting, but to install Ubuntu 12.04 without GRUB, download the alternate CD for x86 or AMD64. Run the install as normal, after the Select and install software step, the installer will run Install the GRUB boot loader on a hard disk .

Is GRUB a boot manager?

GNU GRUB is a Multiboot boot loader. It was derived from GRUB, the GRand Unified Bootloader, which was originally designed and implemented by Erich Stefan Boleyn. Briefly, a boot loader is the first software program that runs when a computer starts.

Is GRUB needed with UEFI?

Although the EFI stub is designed to boot a kernel directly from the UEFI firmware (without a bootloader like GRUB), GRUB needs the kernel to be loaded to support the EFI handover protocol enabled by this option.

Does Linux need a bootloader?

If a computer is to be used with Linux, a special boot loader must be installed. For Linux, the two most common boot loaders are known as LILO (LInux LOader) and LOADLIN (LOAD LINux). An alternative boot loader, called GRUB (GRand Unified Bootloader), is used with Red Hat Linux.

How do I start Ubuntu without GRUB menu?

GRUB_TIMEOUT = 0 – It will boot the default OS immediately. However, you may set it to 3 or 5 so you can press ESC (F4 or hold Shift) during the time to show the boot menu if need. GRUB_DISABLE_OS_PROBER=true – Disable “/etc/grub.


With UEFI, the core of GRUB (or even all of it) can take the form of a single grubx64. efi file within the ESP partition. GRUB has its own architecture identifiers: the version of GRUB for BIOS is known as the i386-pc version, and the UEFI version on 64-bit x86 hardware is known as the x86_64-efi version.

Where is GRUB install EFI?

Use chroot to install grub to the device
  1. Enter the RFS directory: $ cd /rfs.
  2. Create the EFI directory under boot: $ sudo mkdir -p boot/efi.
  3. Bind mount the /dev, /sys, and /proc directories. …
  4. Bind mount the your EFI mount point directory: …
  5. Enter the chroot jail: …
  6. Install grub to your Linux partition.

How do I create a GRUB partition?

HOW TO create and use a dedicated GRUB partition.
  1. Step 1: prepare a partition for GRUB. A dedicated GRUB partition only needs a dozen or so megabytes. …
  2. Step 2: Mount the GRUB partition. Make a mount point for the GRUB partition and mount it: …
  3. Step 3: Copy GRUB to the new partition. …
  4. Step 4: Make a custom grub.cfg.

How do I boot from GRUB 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.

What is os Prober?

os-prober is a command that lists other operating systems. It is used during installation and reconfiguration to create a GRUB boot menu that shows other installed OSes as well as Ubuntu.

Does manjaro use GRUB?

Overview. In order to load the operating system, a Linux-capable boot loader such as GRUB, rEFInd or Syslinux needs to be installed to the Master Boot Record (MBR) or the GUID Partition Table (GPT) of the media containing the Operating System. Installations created using Manjaro ISO defaults to GRUB.

What is GRUB command line?

The GRUB (Grand Unified Bootloader) is a tool for booting and loading operating system kernels and the default bootloader for systems based on the Linux kernel. Although it runs first when a machine is turned on, regular users rarely see GRUB in action. It functions automatically and requires no user input.

Where is GRUB config file?

/boot/grub folder
The main Grub 2 configuration file, normally located in the /boot/grub folder, is grub. cfg. It is the product of various scripts and should not normally be edited directly.