ENABLE ROOT USER IN LINUX

Root user is super user in linux operating system. In ubuntu, it is not enabled by default. To Enable "root" user in linux, follow below commands.

First Change the password of root by executing below command

sudo passwd root

This will ask you enter password. After configuring the password, unlock root user by following command.

sudo passwd -u root 

 
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Configuring Java Delopment Kit in LINUX

One of the important topic for beginners in linux operation system is the steps of configuring JDK (Java Development Kit). Below are the steps which helped me and I hope that they will do the same in your case also.

Execute below commands by replacing the statements in bold format. Run these commands after logging in super user.

update-alternatives --install /usr/bin/java java /home/zeeshan/Downloads/jdk1.8.0_60/bin/java 100

update-alternatives --install /usr/bin/javac javac /home/zeeshan/Downloads/jdk1.8.0_60/bin/javac 100


To Remove Configuration of JDK use following commands

 sudo update-alternatives --remove java home/zeeshan/Downloads/jdk1.8.0_60/bin/java

 sudo update-alternatives --remove javac home/zeeshan/Downloads/jdk1.8.0_60/bin/javac

In case if above solution help you then please leave a comment for maximizing credibility of defined solution.

Thanks.