I think the upgrade was correct.

First, I closed the old electrum application then I executed from a terminal:

sudo pip install http://download.electrum.org/Electrum-1.9.5.tar.gz#md5=e8d66b08f7d1d745e1de04a090d199c2

Now when I open electrum I can read the versión 1.9.5 in the title bar but the new control functions don't appear.