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Make sure that you select the NTFS Primary Partition that you’ve created earlier as your Windows 10 installation partition. After this, choose Custom Installation, because the automatic option may create issues. First, you’ll need to provide the Windows Activation Key to authenticate your installation. Use the bootable DVD/USB stick to start the Windows installation process. Keep in mind that all data in the existing partition will be erased.
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If you already have a logical/extended partition, you’ll need to delete it and create a new Primary Partition. To create the partition, use the gParted or Disk Utility command-line tools. You need to create this on Ubuntu, specifically for Windows installation purposes.
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If you want to install Windows 10 in Ubuntu, make sure that the intended partition for the Windows OS is the Primary NTFS partition.
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