Ubuntu packages updating

Ubuntu package/software's are can be updated using GUI tool. In case you want to do it from the terminal you have to use apt-get command.

apt-get update
Used to sync with package index from the source via Internet.

apt-get upgrade
Used to perform an upgrade to all existing installed packages

apt-get install
Used to install new packages on the system or upgrade existing installed system.

apt-get purge
Used to remove packages and configuration files.