Quando você adiciona um novo repositório apt aos sources do seu Ubuntu, independente de qual versão você esteja usando, você deve baixar a chave (key) de autenticação daquele repositório. Geralmente esse processo é manual e individual para cada repositório e é feito da seguinte forma:
sudo apt-key adv –recv-keys –keyserver keyserver.ubuntu.com KEY
Porém achei um shell script de autoria de Dominic Evans (https://launchpad.net/~oldman) que automatiza este processo e varre todos os repositórios que você tiver nos sources e baixa todas as chaves de autenticação que estão faltando… excelente!!!
Faça o download: Launchpad-Key-Update (268)
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