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How do I repair Ubuntu from live CD?

How do I repair Ubuntu from live CD?

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.

Where is the grub config file in Ubuntu?

The primary configuration file for changing menu display settings is called grub and by default is located in the /etc/default folder. There are multiple files for configuring the menu – /etc/default/grub mentioned above, and all the files in the /etc/grub.

What is an Ubuntu live CD?

A live CD can be used for a quick demo or test of Ubuntu. Try Ubuntu without any changes to your machine! Windows or whatever you use normally is unaffected after trying this and then rebooting. The standard Ubuntu Cd can be used as a LiveCd as well as an installer. Live mode is the default option when booting from CD.

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 find my grub config file?

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.

How do I regenerate GRUB config?

Rebuild the grub.cfg file by running the grub2-mkconfig -o command as follows:

  1. On BIOS-based machines, issue the following command as root : ~]# grub2-mkconfig -o /boot/grub2/grub.cfg.
  2. On UEFI-based machines, issue the following command as root : ~]# grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg.

How do I regenerate grub config?

How do I update-grub on live CD?

This solution is the exact same as roadmr’s answer except much easier.

  1. Boot into AntiX Live CD.
  2. Menu>Applications>System Tools>Boot Repair.
  3. Select ‘Repair GRUB Configuration file’ (this option does run update-grub)
  4. Select the drive/partition where /boot resides.
  5. Reboot when its finished.