[Solution] How to Fix GRUB
- Configure all the pending packages.sudo dpkg --configure -a
- Fix the broken packages.sudo apt install -fy
- Remove the current grub.sudo apt purge -y grub
- -common grub-common:i386 shim-signedThis may give you a warning that...
- sudo apt install -y grub-pcAfter running this command, it will ask you to point the current sdXY to install the...
- 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.
- Install and run Boot-Repair.
- Click "Recommended Repair".
- Now reboot your system. The usual GRUB boot menu should appear.
How to repair Ubuntu Grub After installing Windows?
Using the Ubuntu Alternate CD
- Boot your system from the Ubuntu Alternate CD.
- When the Ubuntu splash screen comes up with the boot: prompt, type in rescue and press enter.
- Choose your language, location (country) and then keyboard layout as if you were doing a fresh install.
- Enter a host name, or leave it with the default (Ubuntu).
How do you remove Ubuntu and Grub?
Ubuntu partition formatting
- Restart your computer to start ( “Try without installing”) on the Live-CD.
- Go to the menu System → Administration → GParted , you will see an interface similar to the picture above;
- Locate your Ubuntu partitions. ...
How to repair Ubuntu easily?
The Easy Way
- Create Your Live CD/USB. If you don’t already have one, create a live medium to work off of. ...
- Add The PPA. It might seem counter-intuitive, but you can enable a PPA and install software on a live CD. ...
- Install Boot-Repair. Now, you can install Boot-Repair like you normally would with Apt.
- Run The Utility. Finally, you can run the utility. ...
How to repair corrupted Grub?
Method 2 To Rescue Grub
- Get a Live USB stick. I will prefer the Ubuntu Live USB stick.
- Open terminal after booting up into the live desktop.
- Mount the root partition by typing /mnt and boot to /mnt/boot and hit enter. [e.g. sudo grub-install –root-directory=/mnt –boot-directory=/mnt/boot /dev/sda]
How do I fix GRUB error in Ubuntu?
How To Fix: error: no such partition grub rescueStep 1: Know you root partition. Boot from live CD, DVD or USB drive. ... Step 2: Mount the root partition. ... Step 3: Be the CHROOT. ... Step 4: Purge Grub 2 packages. ... Step 5: Re-install Grub packages. ... Step 6: Unmount the partition:
How do I reinstall GRUB Ubuntu?
via Partition Files CopyBoot to the LiveCD Desktop.Mount the partition with your Ubuntu installation. ... Open a terminal by selecting Applications, Accessories, Terminal from the menu bar.Run the grub-setup -d command as described below. ... Reboot.Refresh the GRUB 2 menu with sudo update-grub.More items...•
How do I fix GRUB boot?
Another way to fix your GRUB boot issues is to use a Linux live image to boot from an external device.Download a live Linux installer. ... Use a tool such as Etcher to write the Linux image to an SD card or a USB flash drive.Insert the bootable device and start the computer.Select Try Ubuntu on the welcome screen.More items...•
How do I fix a corrupted GRUB?
The solutionTo fix the problem execute from grub command line: ... Restore boot partition on hd0,0 (first partition on first disk) as in above example from find command. ... Then setup grub on first disk (hd0) – as in above example boot stage1 is located on hd0. ... After command will succeed reboot the server.
How do I repair Ubuntu installation?
How to Fix Broken Ubuntu 20.04 without Reinstalling ItStep 1: Login from Live CD or bootable USB. ... Step 2: Remove the lock files. ... Step 3: Reconfigure dpkg. ... Step 4: Clean local repository. ... Step 5: update all the packages. ... Step 6: install all broken packages and dependencies. ... Step 7: Reboot the system.
How do I regenerate grub config?
Rebuild the grub.cfg file by running the grub2-mkconfig -o command as follows:On BIOS-based machines, issue the following command as root : ~]# grub2-mkconfig -o /boot/grub2/grub.cfg.On UEFI-based machines, issue the following command as root : ~]# grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg.
Where is boot Repair in Ubuntu?
Boot Repair is not available in the official package repository of Ubuntu. So you have to install it from the Boot Repair PPA. Now press
How do I uninstall and reinstall grub?
Uninstalling GRUB 2Open a terminal: Applications, Accessories, Terminal.Optional: Make backup copies of the main GRUB 2 directories and files. sudo cp /etc/default/grub /etc/default/grub.old. ... Remove GRUB 2. sudo apt-get purge grub-pc. ... Install GRUB 0.97. ... With grub installed, the user must still create the menu. ... Reboot.
How do I open grub menu in Ubuntu?
With BIOS, quickly press and hold the Shift key, which will bring up the GNU GRUB menu. (If you see the Ubuntu logo, you've missed the point where you can enter the GRUB menu.) With UEFI press (perhaps several times) the Escape key to get grub menu.
Why does grub get corrupted?
The GRUB boot loader can sometimes be damaged, compromised or deleted in CentOS due to various issues, such as hardware or software related failures or sometimes can be replaced by other operating systems, in case of dual-booting.
How do I restore a missing GRUB boot loader?
Steps to recover deleted GRUB bootloader in Linux:Boot into Linux using Live CD or USB Drive.Get into Live CD mode if available. ... Launch Terminal. ... Find Linux partition with working GRUB configuration. ... Create temporary directory to mount Linux partition. ... Mount Linux partition to the newly created temporary directory.More items...
How do I use grub rescue?
The process to do that is simple. on start menu, select run and type msconfig. ... set boot=(hd0,msdos6)set prefix=(hd0,msdos6)/boot/grub.insmod normal.normal.sudo update-grub.sudo grub-install /dev/sda.grub rescue> ls.More items...
How do I reinstall grub bootloader?
ResolutionPlace your SLES/SLED 10 CD 1 or DVD in the drive and boot up to the CD or DVD. ... Enter the command "fdisk -l". ... Enter the command "mount /dev/sda2 /mnt". ... Enter the command "grub-install --root-directory=/mnt /dev/sda". ... Once this command completes successfully reboot your system by entering the command "reboot".
How do I uninstall and reinstall grub?
Uninstalling GRUB 2Open a terminal: Applications, Accessories, Terminal.Optional: Make backup copies of the main GRUB 2 directories and files. sudo cp /etc/default/grub /etc/default/grub.old. ... Remove GRUB 2. sudo apt-get purge grub-pc. ... Install GRUB 0.97. ... With grub installed, the user must still create the menu. ... Reboot.
How do I rescue repair and reinstall grub bootloader in Ubuntu?
The graphical wayInsert 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.Install and run Boot-Repair.Click "Recommended Repair".Now reboot your system. The usual GRUB boot menu should appear.
How do I uninstall grub?
To remove it:Hit Windows + X and select Disk Management .Find the Ubuntu partition. It will probably be a large partition without a drive letter.Be sure you have the correct partition!Right-click the partition and delete or reformat it with a Windows filesystem.
Reinstall Ubuntu GRUB Boot Loader
1. After you’ve downloaded and burned the Ubuntu ISO image, or created a bootable USB stick, place the bootable media into your appropriate machine drive, reboot the machine and instruct the BIOS to boot into Ubuntu live image.
Manually Reinstall Ubuntu Grub Boot Loader
14.
How to install boot repair in Ubuntu?
To start the installation of Boot Repair in the Ubuntu live environment, open up a terminal window. To open up a terminal window in the Ubuntu live environment, press the Win key on the keyboard and search for “terminal.”. Or, press Ctrl + Alt + T on the keyboard.
How to make a live USB for Ubuntu?
Step 1: Go to another working PC that you can use in place of your broken Ubuntu PC. You will need a PC to create a bootable Ubuntu live USB. Once on the spare PC, head over to Ubuntu.com, click on the “Download” button.
What happens after a GRUB bootloader is repaired?
After a successful GRUB bootloader repair, a ‘Boot successfully repaired’ message will appears on your screen. It will provide a URL where you will find all the information regarding the boot repair. You can now reboot and system and boot your system with the repaired GRUB bootloader.
Why is my Grub file damaged?
One of the major reasons for damaging the GRUB files is having multiple bootloader directories for different distributions and operating systems. Using Ubuntu and Windows together in a dual boot system is commonly used very often.
Why use Ubuntu server ISO?
Using a Ubuntu server ISO file to repair a Ubuntu desktop or server is clever because the ISO server file size is smaller than the desktop LTS file. It takes a short time to make a bootable file and quick to boot. Here, we will see how to use the Ubuntu server ISO file to recover and repair the GRUB bootloader file on Ubuntu.
Can you run a live test on Linux?
Final Words. One of Linux’s ISO files’ best features lets you look at it before installing it on your machine. You can run a live test on your system; later, you can choose if you want to install it or not. This feature is not only helpful to test drives; it can help to recover your operating system if you accidentally remove or mess up with ...
What causes a GRUB to break?
There are many possible causes to a GRUB break: Windows writing on the MBR, DRM preventing GRUB from installing correctly, installer bug, hardware change...
Can Windows see Linux partitions?
1. Windows does not see Linux formatted partitions. You need to use gparted from a liveCD and create a primary partition formatted NTFS with the boot flag. Some have had issues if the new primary partition is after the extended partition as Windows does not always reset partition table correctly.
What is GRUB 2?
Grub 2 was a long awaited and very important upgrade over the previous version of the most popular and widely used boot manager in existence. Support for new filesystems, themes, improved splash capability, better internationalization, power-pc booting, dynamic module loading and scripting support. All this is great, but things can still go wrong and break unexpectedly. This basically means that a bootable partition (operating system) may become inaccessible and this is why Grub v2 offers a powerful rescue mode. Now using this mode, may not be exactly a walk in the park for most inexperienced users out there, so here's a guide on how to easily fix your Grub with the Boot Repair tool.
What is boot repair?
Boot Repair is a simplistic but powerful enough tool that promises to repair the most frequent problems that may arise on a Grub installation. The tool is usually not available through the default repositories of most distributions out there, so users will have to install it from 3rd party repositories. One example that contains the latest version of the software (there are many others too) is the yannubuntu ppa. Ubuntu/Mint/ElementaryOS users may install this tool by typing the following commands on a terminal:
Installing Boot Repair on Ubuntu
Boot Repair is the most commonly used tool to fix errors regarding Grub boot loader.
Using Boot Repair to fix Grub
One Boot Repair tool is launched from Unity > Applications > Boot Repair option, here is the welcome screen you should see.
Conclusion
There might be many reasons for broken Grub, especially if you are running multiple operating systems or your system faced power down issues during important updates/installation processes. It’s good to have such a nice, free application like Boot Repair, as it helps resolving boot issues with your system.
What is a GRUB?
GRUB or Grand Unified Bootloader is a bootloader package developed to allow users to select from two or more operating systems installed on a single disk. GRUB is what makes dual booting a PC with Windows and a Linux distribution such as Ubuntu possible. You can always install two operating systems on a disk but you’ll only be able ...
How does boot repair work?
Boot repair takes care of most of the other things that you would otherwise have to manually do via more complex commands. It also lets you copy the commands so you can simply paste them into the terminal and execute them easily.
Is the Grub still there?
GRUB is still there but the Windows bootloader takes preference over it, thus booting right into Windows. Today, we’ll see how to edit or repair GRUB boot menu.
Can you change the boot order of a Grub?
You can also change the boot order, so it would boot into your OS of choice by default unless you choose otherwise at the time of boot. GRUB can be edited using a tool called GRUB Customizer. To install it, just execute the following commands in a Terminal window.
Can I boot Ubuntu from USB?
In this case, you have access to your Ubuntu system so you don’t necessarily need to boot from a USB drive. Boot your PC via a bootable Ubuntu drive and select Try Ubuntu. This allows you to use a Live Ubuntu session directly from your USB drive without having to install anything.
GRUB Boot Issues
The most common reason for GRUB not booting into the operating system is another OS's bootloader overwriting GRUB boot configuration. The problem occurs during an attempt a dual boot with an existing Linux installation. Another reason is the accidental removal of GRUB configuration files.
GRUB Rescue Commands
Below is the list of the commonly used GRUB Rescue commands. Use the commands in the prompts mentioned in the previous section.
Fixing Boot Failure
This tutorial covers two ways to resolve GRUB boot issues, using the GRUB Rescue prompt, and the Boot Repair tool.
