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Change DNS in Ubuntu Without Rebooting

First, find the DNS servers:

Ubuntu >= 15: nmcli device show | grep IP4.DNS

Ubuntu <= 14: nmcli dev list iface | grep IP4

Second, change the DNS servers using the GUI.

Third, restart the service without rebooting the system:

Ubuntu >= 15: sudo systemctl restart NetworkManager.service

Ubuntu <= 14: sudo service network-manager restart

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