Sudo apt install dkms linux-headers-$(uname -r) build-essential If they are not installed, you can run the command below to do the installation. The ii means that the package is installed. Ii dkms 2.2.0.3-2ubuntu11.6 all Dynamic Kernel Module Support Framework Ii build-essential 12.1ubuntu2 amd64 Informational list of build-essential packages You can verify the installation by running the command below sudo dpkg -l | grep -E 'dkms|linux-headers-$(uname -r)|build-essential' Installing Guest Additions from Virtual Box Managerīefore you can proceed, you need to install some required packages such as Linux Kernel headers, dkms and build-essentials if they are not installed. This guide demonstrates the installation of Guest Additions on Ubuntu 18.04 virtual machine. VirtualBox Guest Additions are designed to be installed within the guest operating system. I think it was successful, since when I run lsmod | grep vboxguest, I get the output: vboxguest 45056 0, which I gather means that the Virtualbox kernel module is installed and that the guest additions have been installed correctly.Install VirtualBox Guest Additions on Ubuntu 18.04 I know that this way this should work is by installing guest additions, and I've done this. When I go to full screen mode, the 'Ubuntu screen' is still windowed and very small. I've set up the virtual machine all fine, but would like to view it in full screen mode, but I can't do this. I'm running an Ubuntu 20.04 virtual machine on Virtualbox. I know this is a fairly commonly asked question, but I've followed the other solutions and none of them seem to solve my problem.

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