Rather than asking here, why not just give it a try? Either it will install and work properly, or it will not. You won't damage anything by trying.
I've run VirtualBox on a wide variety of hardware over the past few years. I'd be more concerned about memory size than any of the things you listed. 4 GB is probably the absolute minimum for the Windows host, so you can give the Ubuntu VM 1.5 GB and leave 2.5 GB for the Windows host. Anything less than 4 GB will likely give you pretty abysmal performance with lots of disk swapping. I upped my memory to 16 GB a couple months back so I can give both my Kubuntu host and my Windows VM 8 GB each.
You can install VB from the repositories, but I recommend using Oracle's own repository by following the instructions here: https://www.virtualbox.org/wiki/Linu...xdistributions. VirtualBox will then always be current and updated by apt like any other package. Just a word of warning to avoid confusion. If you specify
Code:
deb [arch=amd64] https://download.virtualbox.org/virtualbox/debian focal contrib
in sources.list, you may notice that you get a binary named virtualbox-6.1_6.1.16-140961~Ubuntu~eoan_amd64.deb. Oracle doesn't release a new version for every new release of Ubuntu. The eoan (19.10) version works just fine on my 20.04 focal machine.
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