1. Open Ubuntu Software app, search for and install dconf editor
2. Then launch the tool from application launcher, and navigate to org/gnome/desktop/wm/preferences
3. Click the line says ‘button-layout’ to edit it. And close default value and set its value to: close,maximize,minimize:
Ubuntu 17.10 Tip: Move Window Buttons ‘min, max, close’ to Left
原文：http://www.cnblogs.com/zhuangliu/p/7798614.html