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If package is already installed it will try to update to latest version.
First, open the Terminal application and type following two commands (Application Please note that above two commands will fetch files from the Internets or local mirrors.
The location of update pages is specified in /etc/apt/(repositories).
You need NOT to make any changes to this file until and unless you need extra repositories for your setup.
Type the following apt-get command: in addition to performing the function of upgrade, also intelligently handles changing dependencies with new versions of packages; apt-get has a “smart” conflict resolution system, and it will attempt to upgrade the most important packages at the expense of less important ones if necessary. The /etc/apt/file contains a list of locations from which to retrieve desired package files. It works like Microsoft or Red Hat update manager i.e.
you will see a little icon in the kicker bar/taskbar when there are updates.
It will only appear when new upgrades are available.
All you have to do is click on it and follow the online instructions.
Ubuntu Software Center is a utility for installing, purchasing, and removing software in Ubuntu, a major part of Ubuntu’s overall software handling.