虚拟机安装了Ubuntu，但是显示设置里没有缩放按钮，高分辨率屏幕太小，可以改下面的内容手动设置缩放比例。
\home\用户名称\.config\monitors.xml
<monitors version=”2″>
<configuration>
<logicalmonitor>
<x>0</x>
<y>0</y>
<scale>2</scale> –缩放比例
<primary>yes</primary>
<monitor>
<monitorspec>
<connector>Virtual1</connector>
<vendor>unknown</vendor>
<product>unknown</product>
<serial>unknown</serial>
</monitorspec>
<mode>
<width>2560</width>
<height>1600</height>
<rate>59.986587524414062</rate>
</mode>
</monitor>
</logicalmonitor>
</configuration>
</monitors>