I usually connect to the internet via USB on my laptop running Ubuntu 18.04. Before the login screen, I can see I have access to the internet. If I press CTRL+ALT+F2 and go to the tty2 screen, I can manually log in and access the internet (for instance, I can run sudo apt-get update without problem).

However, recently I have noticed that once I log in, the connection drops and network-manager is never able to connect again. It endlessly crashes at the Network activation part.

What is wrong with it?

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