After installing a Guest-OS, I tried to increase the screen-resolution(using the arrow key at the lower-right corner of the virtual-box guest OS screen)... to fit into my host. Here is a screenshot of the error I got:

Screenshot 2018-ubuntu-guest-os-resolution

A little googling around and I found a nifty command that solved the issue:

Log into the Guest-OS, and as root, use this:

command: apt-get install virtualbox-guest-dkms

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