How to Fix an Ubuntu System When It Won’t Boot
- Check if You Can Access the GRUB Boot Loader. The first thing to check is whether you can access the GRUB2 boot loader. ...
- Repair GRUB If You Can’t Access It. If you can’t access GRUB, you’ll need to repair it. ...
- Use Recovery Mode If You Can Access GRUB. ...
- Reinstall Ubuntu While Keeping Files and Programs. ...
Full Answer
How to restore GRUB bootloader in Ubuntu?
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 to change Grub boot order in Ubuntu?
When Grub Customizer opens, do:
- navigate to General settings tab.
- Select an OS entry as default from the drop-down box after ‘predefined’
- You may also change other settings: menu timeout, kernel parameters, font, background image, etc.
- Finally click the Save button to apply changes.
How to repair Grub boot?
Steps to Repair GRUB Boot Menu
- Once boot repair is installed, you can quickly search for it by pressing the Windows key and typing boot repair. Launch Boot repair.
- It takes a little time to load up and when it does, select Recommended repair .
- Boot repair will guide you through the entire process. ...
How to restore Grub After installing Windows 10?
Solution 2: Resetting the BIOS Settings
- Turn off your computer and wait for a couple of minutes, then give it a fresh restart.
- Now, press F2 and repeat the process till you see the System Screen Window. The function key may vary from system to system.
- Now with the help of the Right Arrow Key go to the Exit menu bar. ...
- After you pressed the Load Optimized Device option, hit the Enter button. ...
How do I fix Ubuntu when it wont boot?
If Ubuntu is not booting, work through these five steps:Check for bootable devices.Is the GRUB bootloader working?Repair the bootloader menu.Reinstall Ubuntu.Replace faulty hardware.
How do I fix GRUB2?
Continue with the follow Procedure.Regenerate the GRUB2 configuration file and reinstall the bootloader into the MBR, as described in Adding other operating systems to the GRUB2 menu.Exit this temporary root filesystem. exit.Your bootloader should be now restored. Reboot your computer to boot into your normal system.
How do you fix a broken GRUB boot?
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 resolve grub issues in ubuntu?
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 corrupted grub in Linux?
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 reinstall GRUB2 from rescue mode?
In order to reinstall GRUB2 you have to boot into rescue mode....Booting into rescue mode and reinstalling GRUB2Boot from the RHEL7 installation DVD by altering the boot order in Bios and selecting DVD media as the first booting preference. ... At the boot screen, Select the Troubleshooting option at the end of the screen.More items...
How do I install boot-Repair?
Getting Boot-Repair The easiest way to use Boot-Repair is to create a live-USB disk of Boot-Repair-Disk (a disc starting Boot-Repair automatically), and boot on it. Remark : it is recommended to install the ISO on a live-USB (eg via UnetBootin or LiliUSB or Universal USB Installer).
Can not install boot-Repair?
Unable to install boot-repairBoot to LiveCD.Connect to Internet.Open terminal.Give command sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update.Then give command sudo apt-get install -y boot-repair && boot-repair.
How do I boot Ubuntu into recovery mode?
Booting into recovery modeSwitch on your computer.Wait until the UEFI/BIOS has finished loading, or has almost finished. ... With BIOS, quickly press and hold the Shift key, which will bring up the GNU GRUB menu. ... Select the line which starts with "Advanced options".More items...
How do I rebuild grub?
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 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 boot from grub shell?
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.
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:
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 check if you have a Grub2 bootloader?
The first thing to check is whether you can access the GRUB2 boot loader. Boot your computer while holding the Shift key. If you see a menu with a list of operating systems appear, you’ve accessed the GRUB boot loader.
What to do if you can't access Grub?
If you can’t access GRUB, you’ll need to repair it. You can use an Ubuntu installation disc or USB drive to do this . Boot into the USB drive and use the the Linux system to repair GRUB. We have a guide to reinstalling the GRUB2 boot loader on Ubuntu, either with a graphical Boot Repair tool or by using standard Linux terminal commands.
How to use recovery mode in Ubuntu?
Use Recovery Mode If You Can Access GRUB. If you do see the GRUB boot menu, you can use the options in GRUB to help repair your system. Select the “Advanced options for Ubuntu” menu option by pressing your arrow keys and then press Enter. Use the arrow keys to select the “Ubuntu … (recovery mode)” option in the submenu and press Enter.
What does reinstalling Ubuntu do?
The Reinstall option will wipe away all your system-wide settings and return them to their defaults, but that should fix problems that misconfigured system settings could cause. Advertisement. Select this option and continue through the process to reinstall Ubuntu on your computer.
Does Ubuntu keep my files?
Ubuntu should find your existing installation and give you a “Reinstall Ubuntu” option. When you perform a reinstall, the installer will keep all your personal files and settings. It will even keep your installed software packages, if possible.
Does Ubuntu have a safe mode?
Ubuntu doesn’t offer the Safe Mode and Automatic Repair tools you’ll find in Windows, but it does offer a recovery menu and a reinstall option that keeps your files and programs. If you can’t boot anything — not even a USB drive or CD — you may need to configure the boot order in your BIOS.
