Remove Ubuntu and reinstall Windows

Hello,

Download the ISO file to create a USB drive (minimum 8GB) to update, repair, or reinstall Windows

https://www.microsoft.com/fr-fr/software-download/windows10/

You can create your USB drive with Ventoy and then place the Windows ISO file on it

https://www.ventoy.net/en/download.html

If the PC is old, you need to create the drive in MBR mode

If it is recent (Windows 8 or higher) in GPT mode for EFI > With or without Secure Boot Support depending on the BIOS setting

Boot from it using the Boot Menu key of the PC

You can search on Google "[Brand Model] Boot Menu Key"

Choose "Custom Installation" (Not upgrade)

Delete all system partitions and create a new one (Deletes data).

Hello,

For more details, just read the page dedicated to uninstalling Ubuntu in the Ubuntu documentation.

Good luck