It looks like I'm having the same issue after a complete reinstall of Ubuntu 16.04 to enable full disk encryption and secure boot.
Previously, it was working fine (also Ubuntu 16.04 x64).
In the syslog it shows the error message: modprobe[11418]: modprobe: ERROR: could not insert 'evdi': Required key not available
Last edited by CUnknown; 08-08-2016 at 02:49 PM.
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