Networking, web, email & chat

Wireless Networking Connect to wifi, Hidden networks, Edit connection settings, Disconnecting...	Chat & Social Networking Chat on any network using Empathy, make video calls, install skype, social networking apps	Connect to mobile broadband Connect to the internet using mobile broadband
Email & email software Default email apps	Keeping safe on the internet Antivirus software, basic firewalls...	Network problems Troubleshooting wireless connections, Finding your wifi network,
Networking terms & tips Find your IP address, WEP & WPA security, MAC addresses, proxies...	Virtual Private Networks (VPNs) Connect to a private local network over the internet.	Web Browsers Change the default browser, install flash, install the java plugin...
Wired Networking Wired internet connections, fixed IP addresses...

Ubuntu Documentation