The first step is to go to the Unity Dash and find the “Software Updater” as shown below.
When you open the Software Updater it will check online to see if updates are available.
Once the Software Updater has determined that there are updates to be completed it will give you the option to “Install Now”. Select this option to begin the updating process.
The Software Updater will then begin the process of installing updates to your system as shown below.
Once the updates are complete you may be asked to restart your system to complete the installation. If this is the case just save all of your open programs and then click on “Restart”.
When your computer restarts your computer will be up to date at that current time. Notice I say “at that current time”, updates can become available at any time of day and any day. If your computer did not have to restart then you will not have to do anything else to complete the installation of the updates.
The first step is to open the terminal from the Dash and type in the following command in which you will also need to enter your user password to continue.
sudo apt-get update
The command above will retrieve information from the Ubuntu servers about the current available software. You will then need to enter the following command to actually do the security updates on to your Ubuntu operating system.
sudo apt-get upgrade
Once the above command has successfully run your Ubuntu operating system will be up to date with the latest security patches and updates.
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