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I am new to Linux device drivers. After installing the driver in Ubuntu 14.04, I'm seeing this in dmesg or my module:

module verification failed: signature and/or required key missing-tainting kernel 

I followed this guide on the gentoo wiki. I didn't have the same problem in Ubuntu 12.04.

Following the guide resulted in another warning message like

UNKNOWN request key:"some key".

How can I resolve this problem?

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