Change ubuntu Resolution

Change ubuntu Resolution

You basically need the Guest additions, log into the Virtual Machine to install the following packages:

sudo apt-get install virtualbox-guest-dkms \
virtualbox-guest-utils virtualbox-guest-x11

If it has error:

Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
virtualbox-guest-x11 : Depends: xorg-video-abi-11
                    Depends: xserver-xorg-core (>= 2:1.10.99.901)
E: Unable to correct problems, you have held broken packages.

Using this command:

I did sudo apt-get remove libcheese-gtk23, then sudo apt-get install xserver-xorg-coreand finally sudo apt-get install -f virtualbox-guest-x11. It solved problems for me