Change Ubuntu Boot and Login Screen Like Mac OS X

How To Change Ubuntu Boot and Login Screen Like Mac OS X?

Follw this tutorial :

NB : DWYOR (Do With Your Own Risk)

1. For Ubuntu 14.10/14.04/13.10/13.04/12.10/12.04

sudo add-apt-repository ppa:noobslab/themes
sudo apt-get update
sudo apt-get install mbuntu-bscreen-v3
sudo add-apt-repository ppa:noobslab/themes
sudo apt-get update
sudo apt-get install mbuntu-lightdm-v3

2. For Ubuntu 15.04/15.10

sudo add-apt-repository ppa:noobslab/themes
sudo apt-get update
sudo apt-get install macbuntu-bscreen-v6
sudo add-apt-repository ppa:noobslab/themes
sudo apt-get update
sudo apt-get install macbuntu-lightdm-v6

Source : noobslab.com