I have this issues with my ubuntu apt-get update    ubilli@ubilli-pc ~&gt; sudo apt-get update [sudo] password for ubilli: Ign http://ppa.launchpad.net precise InRelease                                 Ign http://ppa.launchpad.net precise InRelease                                 Ign http://ppa.launchpad.net precise InRelease   .     . . Ign http://ppa.launchpad.net precise/main Translation-en                       Hit http://us.archive.ubuntu.com saucy-updates/universe Translation-en         Fetched 459 kB in 25s (17.7 kB/s)                                               Reading package lists... Done 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 D1106511179518B2 W: There is no public key available for the following key IDs: 3B4FE6ACC0B21F32 W: There is no public key available for the following key IDs: 3B4FE6ACC0B21F32
I get the following error when i do sudo apt-get update  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 6AF0E940624A220   I tried following ways after reading various questions here and also by googling.  I tried  sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6AF0E1940624A220   It did not help. I also tried  sudo gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys   thinking port 11371(default) may be blocked due to firewall.  I also tried to reset everything as follows  sudo rm /var/lib/apt/lists/* -vf sudo apt-get update &amp;&amp; sudo apt-get upgrade   still i get the same error or get update. Any other possible solution I can try?
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