And I use these 2 steps fixed it 
1. the first step is to take note of the public key, for example, there is the 
78BD65473CB3BD13
![image](https://user-images.githubusercontent.com/49427668/105863541-f417e900-602b-11eb-8b12-c5cb368edde7.png)
2. sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 
(public_key)
Then it should be fixed



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