sudo apt-get purge openjdk*
root@ubuntu:~# add-apt-repository ppa:webupd8team/java The program ‘add-apt-repository‘ is currently not installed. You can install it by typing: apt install software-properties-common
apt install software-properties-common
root@ubuntu:~# add-apt-repository ppa:webupd8team/java 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.html Debian 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.html Oracle Java 9 (for both Ubuntu and Debian): http://www.webupd8.org/2015/02/install-oracle-java-9-in-ubuntu-linux.html For JDK9, the PPA uses standard builds from: https://jdk9.java.net/download/ (and not the Jigsaw builds!). Important!!! 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 More info: https://launchpad.net/~webupd8team/+archive/ubuntu/java Press [ENTER] to continue or ctrl-c to cancel adding it gpg: keyring `/tmp/tmp08u3_3hk/secring.gpg‘ created gpg: keyring `/tmp/tmp08u3_3hk/pubring.gpg‘ created gpg: requesting key EEA14886 from hkp server keyserver.ubuntu.com gpg: /tmp/tmp08u3_3hk/trustdb.gpg: trustdb created gpg: key EEA14886: public key "Launchpad VLC" imported gpg: no ultimately trusted keys found gpg: Total number processed: 1 gpg: imported: 1 (RSA: 1) OK
原文：http://www.cnblogs.com/anakin/p/7822811.html