Eclipse startup Error A Java RunTime environment (JRE) or Java development Kit (JDK) must is available in order to run Eclipse.

Eclipse startup times wrong: A Java RunTime Environment (JRE) or Java development Kit (JDK) must be available in order to run Eclipse. No Java Virtual machine is found after searching the following locations: ...

This issue arose when I installed two versions of the Eclipse:galieo+helios in Ubuntu1004, and after uninstalling the former, it was not possible to start the eclipse, and I found the following on the Internet:

Eclipse 3.6 is a strange phenomenon under Ubuntu 10.04, and I have not been tested to determine whether Ubuntu 10.04 or JDK or eclipse itself is responsible for this. This phenomenon is:
The eclipse can be started successfully at the terminal, but the mouse double-click, or start with the starter will appear the following content:
A Java RunTime Environment (JRE) or Java development Kit (JDK) must is available in order to run Eclipse. No Java Virtual machine is found after searching the following locations: ...
The workaround is to enter your Eclipse directory at the terminal and enter:
mkdir JRE CD JRE ln-s your JDK directory/bin bin

Problem Solving!

Eclipse startup Error A Java RunTime environment (JRE) or Java development Kit (JDK) must is available in order to run Eclipse.