From SEEDLabs
Downlaod the digital ocean download for the 20.04 machine and click the link below for instructions.
Ubuntu 20.04
ISO image
Go to this link in which you will be prompted to download an iso file. Create a folder in your home directory for virtual box images and create a folder inside of that one called ISO images. If you are interested in getting this machine up and running in virtual box then message me and ask for help, if you even need it.