$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 apt-get update

$sudo apt-get install oracle-java7-installer

You will be prompted couple of times for permissions and Oracle Policy agreement [You must be agreed to Oracle policies to install Java :-)].

That’s it! Now you have Oracle Java7 installed on your Ubuntu 12.04 environment, to check the Java version run the following on terminal:

$java -version

java version "1.7.0_17"

Java(TM) SE Runtime Environment (build 1.7.0_17-b02)

Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)

Or You can check the java version by searching java in Ubuntu dashboard.

Oracle Java 7 plugin Control Panel -> General Tab -> About

The post Install Java7 on Linux (Ubuntu 12.04) appeared first on Manish Sanger.