[CURIOUSITY] The following packages cannot be authenticate

[hello world :-)]

This question is asked just out of curiosity, and does not require a fix, since I'm going to reinstall Raspbian very soon anyway.

So, just this morning, this showed up out of the blue:
http://i.imgur.com/5cpKHok.png

Eh?
It was working fine yesterday...

[epoch1970]

Try to run apt-get update before install

[hello world :-)]

Try to run apt-get update before install

*facepalm*

Thank you for teaching me that. The knowledge of the apt-get will be passed on from generation to generation...

this was not meant to sound sarcastic!