apt-key add file.key

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Version: GnuPG v1

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=YGvk
-----END PGP PUBLIC KEY BLOCK-----

Guardar en /etc/apt/sources.list.d/zimbra-uclv.list

deb     [arch=amd64] http://repos.uclv.edu.cu/zimbra/811 xenial zimbra
deb     [arch=amd64] http://repos.uclv.edu.cu/zimbra/87 xenial zimbra
deb     [arch=amd64] http://repos.uclv.edu.cu/zimbra/889 xenial zimbra
deb-src [arch=amd64] http://repos.uclv.edu.cu/zimbra/87 xenial zimbra

apt-get update –allow-unauthenticated