Trying to install Ubuntu 20.04 along side windows 10 [duplicate]

partitioning dual-boot

In order to get the guided "Install Alongside Windows" option you need both of the following:

  1. You must have enough unpartitioned free space for Ubuntu.

  2. You must boot the installation media using the same "mode" as Windows is currently installed. So if Windows is installed as UEFI, you must also boot the USB as UEFI. This is most common with Windows 10. If this is a very old Windows installation that has been upgraded several times you might have MBR partitioning. Your BIOS may call this "legacy" or "compatibility".

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