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I want to restrict users from changing network settings like changing IP address of the system and adding new connections,

I have removed administrator rights from the user and user is not able to change the existing connection's settings but still he can create a new connection through network-manager.

How can that be blocked?

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According to the NetworkManager website, it is build 'user-centric' and not 'system-centric'.

Therefore in order to achieve what you want, you should disable NetworkManager and use the init system to restrict the connection. There's a good explanation of how to do this here: Scroll down to disable NetworkManager.

Add an askubuntu question/wiki here to consolidate.

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