nnvidiafb.ko - signed with unkown public key

[emlinux]

Made a big mistake, used auto-update.
It upgraded kernel to 2.6.20-1.3001
Now the nvidafb.ko driver will not load.
module is signed with unknown public key
...

Where does one get this key?
Where/how should it be installed?
Why doesn't the upgrade process install this key?

Thank you

[tho.mei]

Use nvidia driver from livna. It's a rpm package. It will all set right by ervery kernel update.