I've read this link: How to upgrade Ubuntu to specific version?, but I still don't know how to upgrade my system from 16.04.2 to 16.04.3.
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        You only need to update the system, no needed to upgrade
Recommended to upgrade to newest stable version 
this may help you to upgrade: How To Upgrade Ubuntu
to check the start and end of support for each version Ubuntu release end of life
 
    
    
        ASIL
        
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