You asked: How do I repair Ubuntu from live CD?

How do I repair or reinstall GRUB 2 with a Ubuntu Live CD or USB?

Repair Restore or Reinstall Grub 2 with Ubuntu CD or USB

  1. Step 1 – Mount the partition. Start by mounting the partition on which your Ubuntu installation is. …
  2. Step 2 – Bind the directories. …
  3. Step 3 – Use chroot. …
  4. Step 4 – Install and update Grub. …
  5. Step 5 – exit the chrooted system.

How do I repair 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 reinstall grub from Ubuntu live CD?

1 Answer

  1. Boot from the LiveCD and select the “Try Ubuntu” option.
  2. Once booted, open a terminal, either by searching for it or pressing Ctrl + Alt + T .
  3. From the terminal, run sudo grub-install /dev/sdX. …
  4. Search for Gparted in the Live Environment, open it and let it scan.
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How do I restore files from Ubuntu using live CD?

Recover Grub

  1. Boot the Ubuntu Live CD.
  2. Press Ctrl-Alt-F1.
  3. Find the partition where your /boot directory is (normally the root partition) check the previous tip for that.
  4. sudo mount /dev/sda1 /mnt.
  5. sudo chroot /mnt.
  6. grub.
  7. find /boot/grub/stage1 (will output a partition name like (hd0,3) )
  8. root (hd0,3)

How do I fix GRUB on live CD?

via Partition Files Copy

  1. Boot to the LiveCD Desktop.
  2. Mount the partition with your Ubuntu installation. …
  3. Open a terminal by selecting Applications, Accessories, Terminal from the menu bar.
  4. Run the grub-setup -d command as described below. …
  5. Reboot.
  6. Refresh the GRUB 2 menu with sudo update-grub.

How do I reinstall GRUB bootloader?

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 fix broken Ubuntu packages?

How to Find and Fix Broken Packages

  1. Open the terminal by pressing Ctrl + Alt + T on your keyboard and enter: sudo apt –fix-missing update.
  2. Update your system’s package list from the available sources: sudo apt update.
  3. Now, force the installation of the broken packages using the -f flag.

How do I fix Ubuntu when it wont boot?

If Ubuntu is not booting, work through these five steps:

  1. Check for bootable devices.
  2. Is the GRUB bootloader working?
  3. Repair the bootloader menu.
  4. Reinstall Ubuntu.
  5. Replace faulty hardware.
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How do you fix a broken GRUB?

Then do these steps:

  1. Configure all the pending packages. sudo dpkg –configure -a.
  2. Fix the broken packages. sudo apt install -fy.
  3. Remove the current grub. sudo apt purge -y grub*-common grub-common:i386 shim-signed. …
  4. sudo apt install -y grub-pc. …
  5. If everything goes right, grub will be installed correctly.

How do I reinstall Ubuntu without losing files?

How do I reinstall Ubuntu 18.04 without losing data?

  1. Boot your Ubuntu using a bootable USB.
  2. Make sure to backup your data.
  3. Make an attempt to reinstall Ubuntu.
  4. If not successful then delete all directories.
  5. Provide previous name and password if asked.
  6. Reboot your Ubuntu.
  7. Reinstall and restore back your backup data.

How do I reinstall GRUB in rhel7?

Recover/Restore the GRUB – BIOS Based system:

  1. Insert RHEL 7 / CentOS 7 latest DVD on the server or attach ISO image using ILO.
  2. In case of a Virtual machine, attach the ISO image to the VM.
  3. Boot the server using the DVD/ISO image.
  4. Choose troubleshooting option once the system is booted in DVD/ISO. …
  5. Choose the rescue mode.

What is recovery mode Ubuntu?

If your system fails to boot for whatever reason, it may be useful to boot it into recovery mode. This mode just loads some basic services and drops you into command line mode. You are then logged in as root (the superuser) and can repair your system using command line tools.

How do I boot Ubuntu as root?

Here’s how I boot into Ubuntu recovery mode and access the file system as root in write mode.

  1. Hold ‘Shift’ while the machine is starting up to load up GNU GRUB.
  2. Start up Ubuntu in recovery mode.
  3. Choose “Drop To Root Shell Prompt’
  4. By default, this will allow you to access the file system in read-only mode.
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How do I boot Ubuntu in rescue mode?

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.