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This question already has an answer here:

How to check for updates on Version 13.o4? there is a setting for updates, but how can I check manually?

marked as duplicate by Luis Alvarado Jul 24 '13 at 0:15

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sudo apt-get --dry-run upgrade

will check for upgrades, but will not change the system.

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To update, just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:

sudo apt-get update  && sudo apt-get upgrade

What this would do, is to re arrange the package index files and Upgrade Ubuntu system including security update.

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