Eclipse cannot be started by double-clicking on Ubuntu. solution:

You can start eclipse on the terminal, but double-click it, or use the starter to start eclipse as follows:

A Java Runtime Environment (JRE) or Java Development Kit (JDK) must be available in order to run eclipse. No Java virtual machine was found after searching the following locations :...

The reason for this problem is that I am ~ /. The Java environment variable in bashrc. This file will be read when you start the terminal, but it is not global. Therefore, the JRE cannot be found by double-clicking.

Solution: add the Java environment in/etc/profile. Source is OK.

You can also:
Enter your eclipse directory on the terminal and enter:

Mkdir JRE
CD JRE
Ln-s your JDK directory/Bin