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Edit 1: I have found the problem(hope so),and edited the question to be more precise. Sometimes the internet connection on my Ubuntu 14.04 desktop is disconnected(even when I'm using it directly or through remote connection), I have to manually click on the Internet connection icon of the taskbar, and select Wired connection 1 to make it connected again. How can I fix this problem?
I have tried your solution, I will post its result after a while of testing – Thanh Nguyen – 2018-05-23T05:33:18.007
I still have the issue despite trying the above command – Thanh Nguyen – 2018-05-24T07:15:32.490