@fatihoz 

Based on your description, we don't have the same problem. I'm not sure what you really got done - do it in two stages, for clarity, anyway, first create the VM and second stage to load the operating system.

My problem was really bad performance on NTFS, only. With ext4 everything works as it is meant to be.

Based on this description, it is hard to way what the problem is, I suggest to open a new thread and give clarity to the below things:

- are you solely trying to create a VM first?

- do it in two stages and tell where it stops

- have virtualization ON in your BIOS

- have virtualization ON in your VM settings (I think I always turn ON, "virtualize CPU performance markers", because in Win 10 it is a must

- check prerequisites, there may be more for Mint than for normal Ubuntu (even Ubuntu has them since 18.04, check with Google what you need to install)

- there can also be something very wrong in your VM settings

- check that you really boot from ISO image and it is good

As you see, you cannot be absolutely sure, what your VM has before installing operating system, if you don't do VM creation in two stages.

Anyway, I have tried with a large bunch of VMs now, including Kubuntu, many Ubuntu versions, Garudo, many Puppy Linux versions, Debian 85 Ham Radio version. No problems with them. Hosts have been Ubuntu 20.04, lately Kubuntu 20.04.2 or Ubuntu Studio 20.04. Mint host I haven't tried.