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Estava seguindo os passos do site: http://www.diolinux.com.br/2014/03/como-instalar-java-8-no-ubuntu.html e ao tentar executar o primeiro comando para baixar o repositório já deu problema (erro no servidor de chaves): jeferson@jeferson-System-Product-Name:~$ sudo add-apt-repository ppa:webupd8team/java[sudo] password for jeferson: Oracle Java (JDK) Installer (automatically downloads and installs Oracle JDK7 / JDK8 / JDK9). There are no actual Java files in this PPA.More info (and Ubuntu installation instructions):- for Oracle Java 7: http://www.webupd8.org/2012/01/install-oracle-java-jdk-7-in-ubuntu-via.html- for Oracle Java 8: http://www.webupd8.org/2012/09/install-oracle-java-8-in-ubuntu-via-ppa.htmlDebian installation instructions:- Oracle Java 7: http://www.webupd8.org/2012/06/how-to-install-oracle-java-7-in-debian.html- Oracle Java 8: http://www.webupd8.org/2014/03/how-to-install-oracle-java-8-in-debian.htmlImportant!!! For now, you should continue to use Java 8 because Oracle Java 9 is available as an early access release (it should be released in 2016)! You should only use Oracle Java 9 if you explicitly need it, because it may contain bugs and it might not include the latest security patches! Also, some Java options were removed in JDK9, so you may encounter issues with various Java apps. More information and installation instructions (Ubuntu / Linux Mint / Debian): http://www.webupd8.org/2015/02/install-oracle-java-9-in-ubuntu-linux.html Mais informações: https://launchpad.net/~webupd8team/+archive/ubuntu/javaPressione [ENTER] para continuar ou ctrl-c para cancelar a adiçãogpg: chaveiro `/tmp/tmpb7o0v755/secring.gpg' criadogpg: chaveiro `/tmp/tmpb7o0v755/pubring.gpg' criadogpg: requisitando chave EEA14886 de servidor hkp - keyserver.ubuntu.comgpg: keyserver timed outgpg: Recebimento de informação do keyserver falhou: erro no servidor de chavesjeferson@jeferson-System-Product-Name:~$