gpg: can't import key: "new key but contains no user ID - skipped"
Solution 1:
You are probably using the keys.openpgp.org keyserver, which has an owner approval system – it will strip all user IDs unless the owner of the corresponding email address has allowed them to be published.
Try to download the key from elsewhere, such as:
--keyserver hkps://keyserver.ubuntu.com-
--keyserver hkps://pgp.surf.nl(ex-SKS pool) -
--keyserver hkp://pgp.rediris.es(ex-SKS pool)
(Future GnuPG versions will accept keys without an UID, although it won't be terribly useful except for direct fingerprint-based comparison.)