Thankyou Lynne that has cleared up the problem. Your missing the gpg
keys your system uses to verify the repository before it gets packages
to update with. This is designed to ensure you get the proper packages
form a known signed source. To fix this we need to import the keys for
each repo into your system. Please follow the steps below to do this.

Using the terminal again do (without the quote)

"sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys
16126D3A3E5C1192 40976EAF437D05B5"

then

"sudo apt-get update"

Hopefully this will eliminate the errors you have been getting.

Regards Jason.

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Title:
  Ok I got an UPDATE 3 days ago

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