First of all canonical removed Users and Groups which would enable you to change the groups the current user is in, you could use usermod but eeehh! this can be fixed by installing gnome system tools , in terminal
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sudo apt-get install gnome-system-tools
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sudo gedit /etc/resolv.conf
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# Generated by NetworkManager
nameserver 127.0.0.1
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# Generated by NetworkManager
#nameserver 127.0.0.1
nameserver 8.8.8.8