Update Manager Error

[joerow]

I'm trying to install updates using the update manager, the updates are shown in the image below. http://img408.imageshack.us/img408/6226/screenshotosq.png

but when I try to install the packages I get the error:


Requires installation of untrusted packages

The action would require the installation of packages from unauthenticated sources.

Details:
firefox firefox-branding firefox-gnome-support xulrunner-1.9.2

Not sure what I should do. I've not changed any of the repositories recently. Although I did install the firefox 4.0 beta for a while but then removed it.

Any ideas?

Thanks

Joe

[plucky]

What does
sudo apt-get update from a terminal show you?

[joerow]

It runs through them all then on the last line it gives:

W: GPG error: http://ppa.launchpad.net maverick Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EF4186FE247510BE

[plucky]

It runs through them all then on the last line it gives:

Try from a terminal
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EF4186FE247510BE
sudo apt-get update

If that doesn't work,post output of
cat /etc/apt/sources.list
ls -l /etc/apt/sources.list.d/

Good Luck

[joerow]

[QUOTE=plucky;10190331]Try from a terminal
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EF4186FE247510BE
sudo apt-get update

That worked great thanks!