I have tryed to open it in VMPlayer but got internal error.
Try to use an ubuntu distributive offitial repository instead

1. Download it from here: https://releases.ubuntu.com/20.04.2.0/ubuntu-20.04.2.0-desktop-amd64.iso
2. In your VMPlayer select "Create a new virtual machine" and then click Browse and find the ubuntu-20.04.2.0-desktop-amd64.iso file.
3. When your fresh Ubuntu will be instlled, run it and enter in a terminal window (CTRL+ALT+T)
4. Follow the instructions here https://medium.com/@jordan.baczuk/how-to-fork-bitcoin-part-1-397598ef7e66 If the mentioned error will persists then this will mean that the instructions are bad, return here again and I will give an instruction how to compile a latest bitcoin version on your ubuntu machine.