Ubuntu Desktop - Screenshot [截图工具]  
 - 1. Search your computer -> Screenshot -> Lock to Launcher
- 2. gnome-screenshot
- 3. System Settings -> Keyboard -> Shortcuts
- References
1. Search your computer -> Screenshot -> Lock to Launcher
2. gnome-screenshot
Grap the whole screen (截取整个屏幕)
 Grap the current window (截取当前屏幕)
 Select area to grab (选择一个截取区域)
 Grab after a delay of 5 seconds (截图延迟时间 5 秒)
 Effects (特效)
 Include pointer (包含指针)
 Include the window border (包含窗口边框)
 Apply effect (应用特效)

3. System Settings -> Keyboard -> Shortcuts
 
References
[1] Yongqiang Cheng, https://yongqiang.blog.csdn.net/