[Voyage-linux] Cannot update Voyage 0.10.0

[Hugo]

Hello,
I am having problems updating Voyage Linux.
When I run "apt-get update" I get:

W: GPG error: http://www.voyage.hk ./ InRelease: The following
signatures couldn't be verified because the public key is not available:
NO_PUBKEY E75D2714D67E2866

Reading some old post I run: 
wget http://www.voyage.hk/dists/experimental/archive.key -O - | apt-key
add 

But this does not solve the problem.

How can I correct this?

Hugo Lia
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