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But after I reconfigure the virtual box to only have one CPU, the problem was just gone. Excerpt

Desktop resolution (Installing Guest Additions)

By default the resolution only went to as higher as 1024 x 768, and the Unity desktop environment does not work.

Solution in short: Install Guest additions, Enable 3D of the VirtualBox settings, install virtualbox-ose-guest-x11 in guest OS.

http://www.virtualbox.org/manual/ch04.html^{Image Removed}

REF

Some details:

1. No Format
   apt-get install dkms

2. Start the virtual machine.Select "Install Guest Addtions" from the "Devices" menu in the virtual machine's menu bar.
3. In the guest Linux, a CD will mount and autorun. Follow the instructions.
   You can also install the virtualbox-ose-guest-x11

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Some details:

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1. package from the Ubuntu package manager but it's better to install the Guest Addition from the VirtualBox tool itself.

Use Shared Folders (ref)

1. You can add shared folders and give each of them a name from the settings of the VirtualBox or from a folder icon at right bottom of the virtual machine window.
2. in the guest Linux, use mount command to mount the folder: sudo mount -t vboxsf sharename /mnt