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Remove Windows entry in GRUB menu


Open terminal (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 sudo update-grub
You can then run cat /boot/grub/grub.cfg to check that your Windows entry has disappeared.

Restart your device to check the same.