Ubuntu: Can't connect with WIFI through nm-applet


I installed Ubuntu Server 14.04 with i3 on my laptop. The reason why I chose for the Server edition is because I wanted a minimal configuration. Additionally, I installed network-manager to help myself connect to WIFI connection. When I run nm-applet I get the overview of available WIFI connections. But when I want to connect with one of the WIFI connections I get the error-message Failed to add new connection: (32) Insufficient privileges.. I've tried this workaround, but unfortunately it didn't work and I still get the same error-message.

PS I've also added my user-account to net-dev group.

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