Example of the error might be like this:
W: GPG error: http://ppa.launchpad.net lucid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EF4186FE247510BEAnd you just need to execute these two commands:
# gpg --keyserver hkp://subkeys.pgp.net --recv-keys KEYJust replace ke KEY with the one that exist on the error. According to the example, the command should be like this:
# gpg --export --armor KEY | sudo apt-key add -
# gpg --keyserver hkp://subkeys.pgp.net --recv-keys EF4186FE247510BEThen you can continue with:
gpg: requesting key 247510BE from hkp server subkeys.pgp.net
gpg: key 247510BE: public key "Launchpad PPA for Ubuntu Mozilla Daily Build Team" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)
# gpg --export --armor EF4186FE247510BE | sudo apt-key add -
OK
# apt-get updateThat's it. Why don't you try it yourself now :)
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