I had installed sun-java, but I want to revert back to OpenJDK 7. I was trying to re-install from the terminal using the command
sudo apt-get install openjdk-7-jre, same from Synaptic and Software Center, but it does not work.
I try to use the command
java -version and then I get a message like
The java program can be found on follow packages» open-7-jre-headless
So, I tried to install it, but they ARE installed on my system...
I do no want format my PC just for Java.