Ubuntu expired apt-get keys FIX

gistfile1.txt

#To find any expired repository keys and their IDs, use apt-key as follows:

apt-key list | grep expired
#You will get a result similar to the following:

pub   4096R/BE1DB1F1 2011-03-29 [expired: 2014-03-28]
#The key ID is the bit after the / i.e. BE1DB1F1 in this case.

#To update the key, run

sudo apt-key adv --recv-keys --keyserver keys.gnupg.net BE1DB1F1