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Thread: Cannot update my system

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hello,

has been 3 days started using unix based os. therefore not able solve problems on own. though have searched lot, not solve update problem. using ubuntu 11.10 , tried updating directly with: sudo apt-get update , via update manager. when try update manager error: "check internet connection" , when use "sudo apt-get update" errors occuring due signature verification. know there lots topics signature verification problem none of them solved problem or maybe missing something. please me?

thanks,
serhan
attached images attached images

maybe changing server help,so under synaptic>repositories> change main or faster (closer don´t remember see option).reload , in synaptic press refresh ( update) , after mark updates ( update system).of course can same thing terminal

code:
sudo apt-get update && sudo apt-get upgrade


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