UltiSnips requires py >= 2.6 or any py3

I'm trying to install UltiSnips in different way but the same message appears each time when I launch vim. Python 2.7 is installed but it seems that vim has been installed before the 2.7 version.

I tryed to reinstall vim using this link:

$ sudo apt-get install mercurial libssl-dev
$ sudo apt-get build-dep vim
$ hg clone http://hg.debian.org/hg/pkg-vim/vim
$ cd vim
$ hg checkout unstable
$ debian/rules update-orig
$ dpkg-buildpackage -i -I
$ cd ..

But the same problem remains. Thanks