Where is the VirtualBox installation folder on Ubuntu?

Solution 1:

The guest additions iso is in /usr/share/virtualbox/VBoxGuestAdditions.iso (if you installed the virtualbox-guest-additions-iso package).

How do I know this?

This command:

dpkg -L virtualbox-guest-additions-iso

lists all the files that the virtualbox-guest-additions-iso package installs and where they are located. You can do this for any package you have installed.

You can also use the Synaptic Package Manager to get this information graphically.

To install the guest additions:

Just boot the virtual machine, and when it gets to the desktop open the Devices menu, click Install Guest Additions CD Image... and follow the instructions.