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Repair/update Grub2

Not see Grub after re-install/upgrade Windows

Fix Grub Not Showing For Windows 10 Linux Dual Boot

Add a new entry to boot an ISO

Pop_OS! does not use Grub, but rather systemd-boot

How to install grub menu on pop os?

Configuration - /etc/default/grub

How to Configure the GRUB2 Boot Loader’s Settings

Configuration options:

  • Scripts in /etc/grub.d
  • Configuration file at /etc/default/grub

Incorporating changes:

  • grub2-mkconfig (or grub-mkconfig for Grub v1) reads configurations and generates a new configuration for /boot/grub2 (or /boot/grub)

Show the grub2 screen

To show the grub2 screen, run sudo nano /etc/default/grub and comment out the line GRUB_HIDDEN_TIMEOUT=0 and change the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="". Remember to run 'sudo update-grub' after any change to grub.

How do I set the grub timeout and the grub default boot entry?

  1. gksudo gedit /etc/default/grub
  2. Change as you like. Save and closed the file.
    • You can change the default from 0 to any number
    • You can change the "hidden timeout" (no menu)
    • You can force the grub menu to show by commenting out the two GRUB_HIDDEN lines with a # at the beginning of the line
    • set the grub menu timeout (default is 10 seconds)
  3. sudo update-grub
  4. Reboot

Grub Customizer - GUI program

Add a splash image

Follow the instruction at Note that Grub2 will search the image based on some priority and there are also some minor requirements on the images. To test

sudo apt-get install grub2-splashimages
sudo cp /usr/share/images/grub/Moraine_Lake_17092005.tga /boot/grub/
sudo update-grub

Boot into command line

  1. Highlight the first item (default) and press 'e' in the GRUB menu
  2. Navigate to the line that starts with ‘linux’, change the runlevel to 3 (at the end of the line). Level 3 means multi-user, command-line only system
  3. Press Ctrl+x or F10 to boot into

To switch back to GUI, type sudo init 5. Level 5 is the default.

Where is grub installed


Run Live Linux on Ram Disk