Recently, because of the need to dive into the Android system, installed on the parallels virtual machine Ubuntu system, the first time the installation was successful, the resolution is only 800*600. Originally wanted to set the inside change, but the pit dad is set inside only 800*600 an option. Finally Google a bit with the help of this post to solve:
http://linuxbsdos.com/2014/10/31/solutions-for-low-screen-resolution-in-ubuntu-14-0414-10-and-virtualbox/
In particular, it is necessary to install a xdiagnose, and then enter in the terminal.
sudo xdiagnose
Set it to the look, click Apply, and then click Close. And then restart the Ubuntu system.
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About the resolution problem when using parallels to install Ubuntu on Mac [resolved]