This question already has an answer here:
I am unclear on this: Are WUBI Installations supported on Ubuntu 14.04? Yes; I know it is on the disk, but I find myself confused why it was put back on there, and questioning whether this was an accident or not. After it was taken off of 13.04, I worked under the assumption that it reached end of life, and that people hence forth should be advised to not use it as a tool.
Is there any official explanation?