Install linux dual system under Windows

(I don"t know why the picture is like this, please deal with it)

install Windows and linux dual systems
is 50G idle. After separating / boot and swap partitions, it becomes unavailable. Why?

by the way, which partition is necessary?

Mar.03,2021

I assume you are using MBR, it can only have 4 primary partitions or 3 primary partitions and 1 extended partition.

Seems like Ubuntu can not recognize the extended partition.

You can create the partitions under windows such as / dev/sda7 . And mount it on / .

Or install the Ubuntu on the whole partition like / dev/sda3 (extend the size under windows before install).
This need mount the whole partition on / .

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