How to install the system updates using commands

hi everyone

well I'm using ubuntu 12.04 , I'm trying to install the update but it keeps giving me a message that the source isn't authorized .
So is there's anyway to install the required updates using the command line ??
Thanks in advance

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alaa sam

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1 Year Ago

Hey dude!

Whats in your list of sources?
/etc/apt/sources.list

kletig

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