Make sure you have installed the guest VM (as explained previously). Then, follow along:
- Log in to your Linux guest VM and first run the following commands within a Terminal window (on a shell):
sudo apt update
sudo apt install gcc make perl
- Install the Oracle VirtualBox Guest Additions now. Refer to How to Install VirtualBox Guest Additions in Ubuntu: https://www.tecmint.com/install-virtualbox-guest-additions-in-ubuntu/.
This only applies if you are running Ubuntu as a VM using Oracle VirtualBox as the hypervisor app.