If it is a single system, just install Windows directly. When Windows is installed, it will change the hard disk boot to Windows and delete grub. For partitions, you can directly delete the partition used by ubuntu.
Directly use the Windows installation USB disk to install, delete all Ubuntu partitions in the partition step, and then install Windows. Get the data you want to keep in advance.
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Just format the corresponding partition of the hard drive directly.
Clear the partition where ubuntu is located, and then install win
If it is a single system, just install Windows directly. When Windows is installed, it will change the hard disk boot to Windows and delete grub.
For partitions, you can directly delete the partition used by ubuntu.
Directly use the Windows installation USB disk to install, delete all Ubuntu partitions in the partition step, and then install Windows. Get the data you want to keep in advance.