chrome update fails

[Florin Andrei]

Running google-chrome-stable on Ubuntu 11.04. There's an update to major 
version 18 available today. I launch the update manager, click install 
updates, and I get an error:

######################################
Requires installation of untrusted packages

The action would require the installation of packages from not 
authenticated sources.

Details:

google-chrome-stable
#######################################

Anyone knows what's going on? Chrome updates worked well until today.

-- 
Florin Andrei
http://florin.myip.org/