How do I uninstall and reinstall grub?

How do I uninstall and reinstall grub?

Uninstalling GRUB 2

  1. Open a terminal: Applications, Accessories, Terminal.
  2. Optional: Make backup copies of the main GRUB 2 directories and files. sudo cp /etc/default/grub /etc/default/grub.old.
  3. Remove GRUB 2. sudo apt-get purge grub-pc.
  4. Install GRUB 0.97.
  5. With grub installed, the user must still create the menu.
  6. Reboot.

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 restore grub mode?

Another way to fix your GRUB boot issues is to use a Linux live image to boot from an external device.

  1. Download a live Linux installer.
  2. Use a tool such as Etcher to write the Linux image to an SD card or a USB flash drive.
  3. Insert the bootable device and start the computer.
  4. Select Try Ubuntu on the welcome screen.

How do I fix corrupted grub in Ubuntu?

The graphical way

  1. Insert your Ubuntu CD, reboot your computer and set it to boot from CD in the BIOS and boot into a live session. You can also use a LiveUSB if you have created one in the past.
  2. Install and run Boot-Repair.
  3. Click “Recommended Repair”.
  4. Now reboot your system. The usual GRUB boot menu should appear.

How do I remove Ubuntu boot options?

Once the disk management window opens, identify the Linux(Ubuntu) partitions and remove it. To do so, follow the process. Check the partitions which has no drive names and are larger than 1gb. (Hint: choose Healthy primary partitions) Once you have identified the partitions, right click >> Delete volume >> Yes.

How do I reinstall grub2?

Open terminal and run sudo fdisk -l to see where Linux is installed on. Run sudo mount /dev/sdxY /mnt where x is altter and Y a number you have found in the previous step. Run sudo grub-install –root-directory=/mnt /dev/sdx to install grub. Run sudo update-grub to update grub.

How do I reinstall grub2 bootloader?

Installing GRUB2 on a BIOS system

  1. Create a configuration file for GRUB2. # grub2-mkconfig -o /boot/grub2/grub.cfg.
  2. List block devices available on the system. $ lsblk.
  3. Identify the primary hard disk.
  4. Install GRUB2 in the MBR of the primary hard disk.
  5. Reboot your computer to boot with the newly installed bootloader.

How do I fix a corrupted grub?

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 fix a broken Ubuntu installation?

How to Fix Broken Ubuntu 20.04 without Reinstalling It

  1. Step 1: Login from Live CD or bootable USB.
  2. Step 2: Remove the lock files.
  3. Step 3: Reconfigure dpkg.
  4. Step 4: Clean local repository.
  5. Step 5: update all the packages.
  6. Step 6: install all broken packages and dependencies.
  7. Step 7: Reboot the system.

How do I fix corrupted grub?

How do I restore Ubuntu to factory settings?

Click on Automatic Reset option in the Resetter window. It will reset the system to its default settings and delete user accounts with their home directories. Click on Yes to continue. Then it will list all the packages that it will be going to remove.

How do I completely reinstall Ubuntu from terminal?

Input “sudo dpkg-reconfigure -phigh -a” into the terminal and press “Enter.” Allow the command to process and the system to reinstall the Ubuntu distribution package.

How do I reinstall grub2 EFI?


  1. Open your Desktop Factory configuration interface: $ make menuconfig.
  2. Navigate to “Target Software->Bootloaders->GRUB2…”
  3. Set “grub2 Platform String” to efi.
  4. Save your configuration.
  5. Remove your existing grub2 build: $ make grub2-distclean.
  6. Rebuild the Factory: $ make.

How do I completely reset Ubuntu?

What is the difference between grub and GRUB2?

GRUB and GRUB2 are two different versions. GRUB2 is considered as default boot loader of Ubuntu whereas GRUB is generally used in RHEL older versions. When started, GRUB2 mainly presents a menu and waits for some input from users. It generally transfers control to our operating system kernel.

How do I rescue Ubuntu?

During the boot, press ‘ESC’ key to go to bootloader screen,

  1. Choose first option “Ubuntu” and then press ‘e’ key to edit.
  2. 2) Append the string “systemd.
  3. 3) Now Press ‘CTRL-x’ or F10 to boot the system in rescue or single user mode.

What are the grub commands?

2.6. GRUB Commands

  • boot — Boots the operating system or chain loader that was last loaded.
  • chainloader — Loads the specified file as a chain loader.
  • displaymem — Displays the current use of memory, based on information from the BIOS.

How do I clean Ubuntu?

Steps to Clean Up Your Ubuntu System.

  1. Remove all the Unwanted Applications, Files and Folders. Using your default Ubuntu Software manager, remove the unwanted applications that you don’t use.
  2. Remove unwanted Packages and Dependencies.
  3. Need to Clean the Thumbnail Cache.
  4. Regularly clean the APT cache.

How do I fix Ubuntu installation?

How do I reinstall EFI partition?

More secure way to restore EFI partition in Windows 10

  1. Select the system backup task and click “Next”.
  2. Select to restore entire backup or a part and click “Next”.
  3. Confirm operations on the “Operation Summary” page and click on “Start Restore” button.
  4. Restart your computer to boot from the original hard drive.

How do I factory reset Ubuntu from terminal?

There is no such thing as factory reset in ubuntu. You have to run a live disk/usb drive of any linux distro and backup your data and then reinstall ubuntu.

Is GRUB the best bootloader?

1. GNU GRUB. GNU GRUB is a popular and probably the most used multiboot Linux boot loader available, based on the original GRUB (GRand Unified Bootlader) which was created by Eirch Stefan Broleyn. It comes with several improvements, new features and bug fixes as enhancements of the original GRUB program.

Is GRUB a bootloader?

GRUB (GRand Unified Bootloader) is a boot loader package developed to support multiple operating systems and allow the user to select among them during boot-up. GRUB was created by Erich Stefan Boleyn and has been further developed under the GNU project as GNU GRUB.