Noob trying to install Windows 10 (dual boot) on his preinstalled Ubuntu 20.04 laptop, cannot partition as Ubuntu is mounted [duplicate]

The entirety of the Ubuntu 20.04 OS is mounted and I need to unmount it, apparently, to have an NTFS partition for Windows.

I'm totally new to Ubuntu and all this tech stuff, I just need some steps to follow, my only problem is the partitioning on Gparted. I'm too scared to press unmount as the OS is running from it and the whole 1TB is there and I need some of it for Windows.

Solution 1:

You're right. You can't unmount and resize a partition that is currently in use.

You can easily use Gparted Live. It's a small bootable Linux that you can boot from USB or CD. Then you can easily do whatever you want with your disk and be sure that disk is not in use.