install additional software on Eclipse Luna over Ubuntu 14.10

For any reason, the process to install additional software on eclipse is tricky. Some days ago I've install pydev+python support on it without any problems. Now I need to add another packages but the access to repos is extremely slow, so in order to fix this on Ubuntu, from command line just pass some args like this:

./eclipse -vmargs -Djava.net.preferIPv4Stack=true

after this you may do an update, install additional software or access to the Eclipse Software Center.

I read a lot at google about this problem, it looks this bug was fixed but several people still got it, anyway, at least for me it works using that parameter.

Cheers