If I do a dual boot of some kind of Ubuntu and Windows, do I get to keep the Windows part as it is now or is it a new installation of Windows? And if I want to make the full switch to Ubuntu, do I then get to keep the installation from the dual boot or do I have to install Ubuntu anew?

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@Sagaliciouzzz Usually you can keep your old windows installation if you install a dual boot. During the installation process done from a Ubuntu USB stick you are asked how you'd like to proceed.
@Sagaliciouzzz If you consider to have both partitions with an encryption, then you should read this:
https://www.mikekasberg.com/blog/2025/05/19/dual-boot-ubuntu-25-04-and-windows-with-encryption.html
How to Dual-Boot Ubuntu 25.04+ and Windows 11 with Encryption

I’ve been writing about how to dual-boot Ubuntu and Windows with encryption for a long time. I first wrote about it back in 2020, where...

@weirdfish That sounds interesting, I'll read up on it before the installation to figure out if I want the encryption or not.
@weirdfish Oh, thank you! So, if I first install Ubuntu on a partioned drive, and then realize I want to remove Windows, should I then run the installation file again and choose to expand the partition to the whole drive?
@Sagaliciouzzz I don't know I never tried it this way. But I think it should be possible to expand the partition with Ubuntu on it from inside of the system.
@weirdfish Sorry, I misread your first response, now I understand. Thank you for your help!