No gpg key from behind a firewall

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http://askubuntu.com – Just stumbled over this closed thread here: GPG Error while running apt-get Same problem here, Ubuntu 12.04 behind a firewall and proxy. I dont think that matter is duplicate of the given topic. So i reopen this matter in this thread. My output: root@musik-Aspire-7741:~# apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 58B98E87 Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret- keyring /tmp/tmp.tWVMhyIMYh --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver hkp://keyser (HowTos)