update-alternatives: error: no alternatives for

Solution 1:

Sun-6-java is being phased out by Oracle and is no longer supported. This is why there are no plugins available for your browser anymore.

OpenJDK is the only stack you should be using as sun-java-6 is outdated and deprecated.

http://en.wikipedia.org/wiki/OpenJDK

If you would like to use Proprietary Closed Source features in Java you will need to install the version from java.com (which is also OpenJDK so don't really see any benefit over the Ubuntu Repository version).

OpenJDK is backwards compatible with the old Sun-6-java. What can you not run with OpenJDK?

Oracle Offers Links to Java 7, you have to go out of your way to get Java 6.

The previous edit to my post by "broiyan" is depricated.