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Open Source For Geeks: W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6AF0E1940624A220
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Resolved) Apt server is broken/down, gives 403 Forbidden (May 2021) · Issue #9105 · IntelRealSense/librealsense · GitHub
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