Step 1: Check your current version (Click on gear icon at top right –> About this computer)
Step 2: Run the following command in the terminal to get the latest update for the current version.
Step 3: Search for updater, click on Software Updater.
Step 4:It would ask you to enter password.
Step 5: You would get the following window to upgrade Ubuntu 13.10, click on upgrade.
Step 6:Now click on upgrade in release note window.
Step 7: You will get update summary, click on upgrade.
Step 8:Now it will start to download the package.
Step 9:If there is any package to be removed, it will popup the window. You can either keep or remove the obsolete packages. it is recommended remove the obsolete packages.
Step 10:Once completed, it would ask you to restart the computer.
Step 11:Once it rebooted, check the Ubuntu version.
That’s All!, now you have latest version of Ubuntu.