KVM is a virtualization solution that helps create Virtual Machines just like VMware or VirtualBox. This article explains KVM installation on Linux Mint.
linuxhint.com
That link will save you a tonne of reading etc
The instructions are fairly straightforward to follow...just copy and paste in the commands to check system compatibility, if it gives an output above 0....you are all set.
Again copy and paste the commands shown there to add your user and libvirt etc etc.....just copy and paste the copmmands in Black....ignore the second command in maroon/red (i have no idea why it is shown twice)
bit late for me to say this...but...make sure you have an .iso file on your desktop or somewhere easy to access.
And....before you create the virtual machine...reboot.
Then....Find Virtual machine Manager in yur menu...open it....click on File....click on New Virtual machine....if yiou have an .iso on your desktop etc....select Local install media (iso image or cd rom).....when asked to select the operating system you are using...it may be in the list there...or it may not be. I had an iso on desktop for a thing called 'Kumander" linux....so I just typed Linux into the box....it didn't seem to like that so I typed generic Linux.....it accepted it.....choose how memory you are going to give it...I have 32 gb of memory so I gave it 20000 MB..(note:..memory there is in MB...not gb)...my cpu is a quad core, so I gave it 4.
My nvme ssd has 200 gb free (approx ) so I gave it 30gb to play in....I think there is a spot there to give it a name if you wish
..Hit the next button or finish...i forget what it was called...
it will finish the process of creating it.