Fix GPG Error Pada Ubuntu

Error GPG adalah Error pada Enkripsi GNU Privacy Guard, ini terjadi karena enkripsi pada file repostory bermasalah, berikut ini adalah cara fix nya.

Contoh Errornya :

Ubuntu@Ubuntu:~$ sudo apt-get update
[sudo] password for jotii:
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Hit http://id.archive.ubuntu.com precise-updates/main Translation-en
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Hit http://id.archive.ubuntu.com precise-backports/universe Translation-en
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97% [Waiting for headers]
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Fetched 704 B in 1min 27s (8 B/s)
Reading package lists... Done
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://extras.ubuntu.com precise Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key <ftpmaster@ubuntu.com W: GPG error: http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG D8A75A3A697B014A Launchpad PPA for Adam Wolf
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG F1773AF13B1510FD Launchpad PPA for GNOME3 Team
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/Release
W: Some index files failed to download. They have been ignored, or old ones used instead.