How to edit Grub Bootloader and remove unwanted entries in Ubuntu

Editing Grub is risky when done manually. Here is an easy graphical way of editing the grub entries!

Grub is the bootloader in most Linux distros that manage the operating systems installed in a computer. If you have installed multiple operating systems like for instance, you have a dual-boot PC running Microsoft Windows and Ubuntu. You should see both entries during the boot process.

In recent days, the use of M.2 and PCI Express NVMe Solid State Drives has increased. So it makes the situation a little complicated when dealing with multiple operating systems on the same PC, especially involving all the different types of media.

One such problem occurred on my test PC. I have Windows 10 and Ubuntu installed on the M.2 NVMe SSD to benefit from the lightning-fast transfer speeds within the operating system. I also have a normal SSD installed which is only for storing the data. I had successfully installed Windows, Ubuntu, and the Grub on the NVMe drive.

Ubuntu Grub
Ubuntu Grub

After a kernel update in Ubuntu, I noticed a new duplicate entry in the Grub pointing to Windows on the SSD. That didn’t make any sense. I don’t have Windows installed on the SSD! Anyway, I tried to select it and see what happens during the boot. Obviously, the screen was blank.

I need to get rid of this duplicate entry. The usual “sudo update-grub” will not fix the issue. Boot Repair can’t fix it either. For some reason, it also thinks Windows is installed on the sda1 drive. Here is what I did to clean up the Grub.

Editing Grub to delete the entries in Ubuntu

Step 1) Launch the “Terminal.” You can use the Ctrl+Alt+T keyboard shortcut.

Step 2) Enter the following command to add the PPA to install “Grub Customizer.”

sudo add-apt-repository ppa:danielrichter2007/grub-customizer

Step 3) Update the system

sudo apt-get update

Step 4) Install the Grub Customizer package.

sudo apt-get install grub-customizer

Step 5) Launch Grub Customizer from the Apps menu.

Step 6) Right-click on the option that you wish to delete and select “Remove.” In my case, I want to delete the “Windows 10 (on /dev/sda1)”

Grub-Customizer User Interface
Grub-Customizer User Interface

Step 7) Click “Save.” The application has the revert functionality and puts the deleted entries in the right pane. You can anytime revert the changes – even after reboot!

Step 8) Restart the PC for new settings to take effect. My Grub got cleaned up from the messier-looking duplicate Windows entry. I’m happy!

Updated Grub
Updated Grub

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  1. This does not work if you are using the Ubuntu install disk. You get the error grub-mkconfig could’t be executed successfully. /usr/bun/grub-probe: failed to get canonical path of /cow.

  2. You have to udate this.
    When I installed it on mint 19.3 it worked ok, now I have upgraded to mint 20 it was removed from the ppa, then when I tried to install it using the above commands, it tells me that v20 does not support “focal” in the ppa.


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