installing linux-headers-standard on Ubuntu 20.04 / WSL2

When I use VBoxManage to create a vm I'm told I need to have linux-headers-generic installed. So I try sudo apt-get install linux-headers-standard and get this message:

Reading package lists... DoneBuilding dependency treeReading state information... DoneE: Unable to locate package linux-headers-standard

https://www.tecmint.com/install-kernel-headers-in-ubuntu-and-debian/ presents another way to do this:

sudo apt install linux-headers-$(uname -r)

Unfortunately, that doesn't work either. Here's what I get:

Reading package lists... DoneBuilding dependency treeReading state information... DoneE: Unable to locate package linux-headers-4.19.128-microsoft-standardE: Couldn't find any package by glob 'linux-headers-4.19.128-microsoft-standard'

Any ideas?