VirtualBox has 2 snapshot recovery options- Revert a Snapshot and Discard a Snapshot.

Be careful, these two options are very different.

NOTE: If you only have ONE snapshot, then either option will return you to the previous state before that snapshot was taken.

With multiple snapshots:

• Revert a Snapshot allows you to use the snapshot before the current snapshot you are using at the moment, but the current snapshot is still stored.
• Discard a Snapshot deletes the current snapshot. Now, you must use the snapshot before the one you just deleted. and your system will be returned to that previous state.

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From http://ubuntu-tutorials.com/2007/10/13/installing-guest-additions-for-ubuntu-guests-in-virtualbox/

VirtualBox has made it pretty easy to install the Guest Additions for improved integration between guest and host. Some of these benefits are mouse-capture improvements and improved video resolution. The mouse capture improvements now allow you to control your virtual machine when the mouse is over the window, and seamlessly return to your host when it is not. Improved video resolution should allow you to customize a better resolution for your guests.

What we need to do to install the Guest Additions is select the option from the VirtualBox menu. You’ll want to do this after your guest is running (the guest-additions are installed to the guest, not the host).

Select Devices > Install Guest Additions…

This sometimes takes a minute so don’t worry if you don’t see anything right away. This should then prompt you and say something along the lines of “The Guest Additions image is not found on your host. Would you like to download this image now?”

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From a Terminal window, enter:

su

This gives you superuser access using the user’s environment

eg. home is

/home/<user>

If you want to have superuser access as the Root user then enter:

su -

This uses the Root user’s environment eg. home is /root.

You can then enter the name (still in the Terminal session) of an app to run, such as Konqueror:

konqueror

and run it as Root.