I've been using VirtualBox to run Ubuntu on my PC.
The screen size is too small.
So here's what you have to do to install GuestAdditions.
1. Start the virtual machine
2. Select "Mount CD/DVD-ROM" from the "Devices" menu in the virtual machine's menu bar and then "CD/DVD-ROM image".
3. Before installing the Guest Additions, you will have to prepare your guest system for building external kernel modules. This works similarly as described in Section 2.3.2, “The VirtualBox kernel module”, except that this step must now be performed in your Linux guest instead of on a Linux host system, as described there.
Again, as with Linux hosts, we recommend using DKMS for Linux guests as well. If it is not installed, use this command for Ubuntu/Debian systems:
sudo apt-get install dkms
4. Mount the VBoxGuestAdditions.iso file as your Linux guest's virtual CD-ROM drive.
5. Change to the directory where your CD-ROM drive is mounted and execute as root:
sudo ./VBoxLinuxAdditions-x86.run
In a 64-bit Linux guest, use VBoxLinuxAdditions-amd64.run instead.
6. Restart the system
7. After the system starts, Host Key + F (Default setting is Right CTL + F) to try out Full Screen mode.
This worked for me, and hopefully this will work for you too.
After all of this, I found a very useful post.
http://www.nerdgrind.com/how-to-increase-screen-size-or-resolution-in-virtualbox-for-ubuntu-or-linux/
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