[ubuntu] Best way to make a VM file of a Ubuntu 20 server

I need to rebuild my Ubuntu server. It's running, but hanging on by a thread, so I'd like to virtualize it, run it in VMWare Pro, HyperV, virtualbox, anything. (I'll rebuild on the hardware)

I wanted to use VMware converter, but it requires going to an esxi server, which I don't have running at the moment.

Any suggestions would be awesome, thanks!