1.540 Install failed

When updating to the new version I received the following error:

WARNING: The following packages cannot be authenticated!
E: There are problems and -y was used without --force-yes

.. install failed!
Closed (fixed)


Howdy -- sorry that you're having a problem with the update!

Is this on a system with Virtualmin Pro or GPL?

Also, what is the output of this command:

uname -a

Odd... I tried installing it again and it went through the process fine.