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

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References

[1] Yongqiang Cheng, https://yongqiang.blog.csdn.net/