Hi everybody,

Hope you've had great holidays! Since this week, I'm getting an error when 
I'm typing in the following command in terminal on ubuntu 12.04 

sudo apt-get update -y

This is the error message I receive in the terminal:

W: GPG error: http://ppa.edx.org precise Release: The following signatures 
were invalid: KEYEXPIRED 1481833680 KEYEXPIRED 1481833680 KEYEXPIRED 
1481833680

Does anyone have an idea how to fix this?

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