How to use sudo command in Ubuntu 12.04 in default guest account

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http://askubuntu.com – How can I use sudo command from terminal in the default Ubuntu 12.04 guest account, in order to connect to vpn client and service. (OpenVPN+TrustConnect+Comodo) I know it has been disable by default(sudo), but I want to use guest account, apparmor, etc, and security feutures of guest account, and still be able to connect to vpn. Vpn client and service wont star without sudo command. (HowTos)