I installed Gnome 3.8 like in link (http://www.omgubuntu.co.uk/2013/04/gnome-3-8-ppa-for-ubuntu-gnome) is described. I installed it, didn't liked it so uninstalled it as there is written. I had some problems with login session which I solved but booting screen is no more purple with Ubuntu logo but blue with strippes. And I think my pc is little slower. Is here anybody who knows how to change this booting screen?
The blue stripes you are seeing is actually the boot splash, which is configured through the plymouth themes. You can change it by executing