Ubuntu

If you are running an older version on java on your Ubuntu 12.04 environment, you must remove it before installing Java7. Do the following to remove: $sudo apt-get purge openjdk* If you installed java 7 earlier and having problem with java then you have to do the following to remove it: $sudo rm /var/lib/dpkg/info/oracle-java7-installer* $sudo apt-get purge oracle-java7-installer* $sudo rm /etc/apt/sources.list.d/*java* $sudo apt-get update Installing Oracle Java7 on Ubuntu 12.04 LTS: $sudo add-apt-repository ppa:webupd8team/java $sudo

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