ubuntu 设置分辨率

I was having the same issue with the resolution. I'm using VirtualBox and the resolution only had one resolution option.

1. I went to the search bar and searched for "Additional drivers"
2. Next, I clicked on "using x86 virtualization solution - guest addition module source for dkms"
3. Lastly, I restarted the virtual machine running Ubuntu.

As soon as it booted back up the resolution was already fixed.

http://askubuntu.com/questions/449820/ubuntu-14-04-screen-resolution-too-low-sis-671-graphics-card