Ubuntu 16.04 solutions appear after the "low graphics-mode use running with default mode can not be networked

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Ubuntu 16.04 emergence of "low graphics-mode Internet there are many solutions, you can reinstall ubuntu desktop methods to solve the problem, but after a period of time will solve this problem so he chose running with default mode  but can not go after such things can restart the network service to solve the problem:

sudo service network-manager restart