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We will show you exactly how to get your Ubuntu system configured and connecting to the Internet wirelessly so you don’t end up being tethered in one corner of the house or office using an Ethernet cable plugged into your router. Please note that if you have a vanilla install and have not fiddled around with network configurations on a command-line before then running through this guide may not be advisable for you. You may feel uncomfortable altering settings on your Ubuntu system unless you feel confident enough to reverse changes and alter any values you don’t understand fully before you make them. We will always assume you have at least a basic understanding of how to use a command-line and have done basic tasks such as apt-get update and apt-get install packages, further any copy/pasting of commands you do from here on are to be performed under your own responsibility. Be cautious with doing so though and if you are unsure of anything, then don’t do anything that might put your system’s state in jeopardy. Also, if you would like our guide on a desktop version too but without requiring access to the network yet, check out our guide on How to Install Ubuntu on a Desktop. In case you would like to learn more how the networking stack on your Ubuntu system is actually put together, then read on while we start off by discussing the physical bits and pieces that are needed to make this guide work. Starting with items required for the OSI’s second physical layer (Open Systems Interconnect reference model). Step 1: Hardware Requirements In order to successfully complete this guide, you will need the following items: - An Ubuntu system – This can be a laptop, netbook, or PC that is capable of installing and running Ubuntu Linux. - A wireless network card – This is essential for connecting to the Internet wirelessly. Internal PCI and external USB adapters as well as PC card slot adapters can fulfil this requirement. - A wireless router – You will need this if you wish to connect to the Internet. The wireless router will need to be configured to connect to your broadband connection. Step 2: Installation of the Wireless Network Card Before you can configure the wireless network card, you will need to make sure it is inserted and recognized by your operating system. Insert your wireless network card into your Ubuntu system. Once it has been recognized, boot up your system and login. Tip: If your card is not recognized, try unplugging the card, shutting down your system and plugging it back in. Step 3: Accessing the Command Line In order to configure your wireless network, you will need to access a command line. This can be found by going to your Applications menu, then to Accessories, and then to Terminal. If this is your first time using the command line, it may seem overwhelming, however, simply follow the instructions in this guide and you will get the hang of it quickly. Step 4: Accessing the Network Configuration Files In order to configure your wireless network, you will need to access configuration files located in the /etc/network directory. This directory contains configuration files for various networking interfaces on your system. Navigate to the /etc/network directory by typing the following command: cd /etc/network Step 5: Configuring Your Wireless Network Now that you have accessed the network configuration files, you can begin configuring your wireless network. Open the network interfaces file by typing the following command: sudo nano interfaces This will open a text editor with the network interfaces file. Underneath the lo interface, add the following information: auto wlan0 iface wlan0 inet dhcp wireless-essid your network name wireless-key your network password Replace your network name and your network password with the name and password for your wireless network. Step 6: Saving and Applying Changes Save the changes you have made to the network interfaces file by pressing Ctrl + X and then selecting Y to save and exit. Restart the networking service by typing the following command: sudo service networking restart If everything has been configured correctly, your wireless network card should now be connected to your wireless network and you should have access to the Internet. You can test this by opening a web browser and navigating to a website. Step 7: Troubleshooting If you are unable to connect to the Internet, make sure that your wireless network card is recognized and inserted properly. If it is recognized but you are still unable to connect, try restarting your system and trying again. If the problem persists, you may need to seek assistance from a more experienced user or a technical support forum.