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I'm trying to install Mongodb on Ubuntu 12 but when I run this command:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10
This returned the error below:

keyserver.ubuntu.com host not found
gpgkeys: HTTP fetch error 7: couldn't connect: no such file or directory
gpg:no valid openPGP data found
gpg: Total number processes :0

I turned off Firewall on Iptables, but it don't work. Is there any idea?

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Can your system resolve keyserver.ubuntu.com as an IP address? I.e, what's the output of dig keyserver.ubuntu.com? –  Xyon Jul 17 '13 at 14:36

3 Answers 3

This may not actually be a problem with looking up the keyserver, which is what the error suggests. The apt-key command calls gpg, which in turn tries to access the keyserver. Apparently there's a bug in gpg whereby if the keyserver doesn't have the key you are requesting, then gpg misinterprets that as "host not found".

It may well be that a non-responsive keyserver will do the same thing, and I have seen environments where the keyservers are blocked (corporate firewall rules), so that could be your root cause if there is an upstream firewall you do not have access to.

Just for reference, the key is there and the keyserver is currently responding for me:

$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.rh1myoBdSE --trustdb-name /etc/apt//trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv 7F0CEB10
gpg: requesting key 7F0CEB10 from hkp server keyserver.ubuntu.com
gpg: key 7F0CEB10: "Richard Kreuter <richard@10gen.com>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1

It may be that the port is the issue (it was the last time when I hit a corporate firewall problem), so try doing this on the standard HTTP port (80) instead, see if that sorts things out:

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
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I faced the same issue as my machine is behind a corporate proxy. Adding the gpg --keyserver-option http-proxy made the trick. Looks like:

sudo apt-key adv --keyserver-options http-proxy=<myProxy> --keyserver keyserver.ubuntu.com --recv 7F0CEB10
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The second approach mentioned in this link worked for me. Manually download the key and add it. The link provides step by step procedure to fix the error happening due to missing key.

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