Installing using apt-get

Couchbase Server
2

Adding the GPG signature solved the issue for me.

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6EF1EAC479CF7903

UPD: If you are having problems with getting the key via standard port (11371) You can force port 80:
apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 6EF1EAC479CF7903

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