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So, basically the situation is that I am trying to dual-boot ubuntu 20.04.2.0 LTS with windows 10.

In System Information of windows, the BIOS mode is Legacy.

Now, I created a bootable Usb using rufus and with default options of MBR and BIOS(or UEFI-CSM) as suggested in official tutorial.

But when I put the usb in and booted the system, by default it simply boots to windows. I had to press F12 to get the list of boot options. The options were like this

BIOS boot mode is Legacy, Secure Boot Off

Legacy-
 Hard Drive
 Usb Storage Device
 Network


UEFI
 Sandisk Usb.. // basically the name of that usb


... //other options

  1. Now, if i choose the option in UEFI it doesn't recognises windows at all and offers the option to only install ubuntu (cleaning all the disks)

  2. Next time, I chose the Usb Storage Device under legacy and here (image) it recognised windows 10 but again doesn't gives the alongside install options as seen in online tutorials. Why?

And, I clicked something else in this case and it opened up the partion manager but I didn't edited anything as it was too complicated. Now, on booting windows - the screen was blank after login and I had to restart it to restore normal work.

So, what is going wrong and how to correct it.

P.S. As commented below, I have 4 primary partitions here. But will fulfilling this criteria of less than 4 partitions, will the above issues be solved. Also, any logic why my screen was going blank (except cursor) after login.

mr.loop
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