You can search for the latest signature at

For example, copy this signature 
a file beginning from 

-----END PGP PUBLIC KEY BLOCK-----and then run

apt-key add <filename>

On Thursday, December 29, 2016 at 4:13:46 AM UTC+8, Bastiaan Franssen wrote:
> 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: 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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