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I was using openSUSE and Manjaro before I start using Ubuntu (kubuntu). Now there's boot options such as windows boot manager, Manjaro, debian, etc. How can I delete those options from my Lenovo laptop bios boot menu?

A. Hayati
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    If UEFI boot menu you use efibootmgr with -b parmeter, details in man efibootmgr. Duplicate of https://askubuntu.com/questions/429610/uninstall-grub-and-use-windows-bootloader/497720#497720 – oldfred Mar 10 '19 at 17:54

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Open your Ubuntu terminal using the key combination Alt + Ctrl + T and follow the below procedure:

  • Paste the following command in terminal sudo gedit /etc/default/grub. It will open a file named /boot/grub/grub.cfg file

  • Add GRUB_DISABLE_OS_PROBER=true at the bottom of this file

  • It will prevent Windows being added to your grub menu

  • Now to write the change, run the command: sudo update-grub

  • You can then run cat /boot/grub/grub.cfg to check that your Windows OS entry has disappeared.

  • Restart your device to check the same
Manu Mathur
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I use "Grub Customizer" which is an easy to use GUI tool to remove or change your grub menu.

There's a whole tutorial on how to download and how to use it here - You really don't need to read it though.

Basically you just install it and choose which options you want from the GUI (it's very simple)

$ sudo add-apt-repository ppa:danielrichter2007/grub-customizer
$ sudo apt-get update
$ sudo apt-get install grub-customizer
mkkl
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  • It's seems to be editor for grub. It only shows my Ubuntu option not other options I used before (like windows boot manager or manjaro) – A. Hayati Mar 10 '19 at 18:20
  • Yeah that's pretty much what it is, but it should show your others boot options as well. Mine shows my Windows boot. Are you running a dual boot setup? – mkkl Mar 10 '19 at 18:46
  • No. I only have Ubuntu (kubuntu). – A. Hayati Mar 10 '19 at 19:59
  • And you are saying that there are options when you start your pc, which you have to select between to start the OS? – mkkl Mar 11 '19 at 10:51
  • Yes. there's other options like windows boot manager. They can't be selected (if you select, computer restarts) but they're there. – A. Hayati Mar 11 '19 at 16:49