Confirmed on askubuntu http://askubuntu.com/questions/449623/howto-restore-the-new-14-04-lockscreen/451451?noredirect=1#451451
Confirmed on askubuntu http:// askubuntu. com/questions/ 449623/ howto-restore- the-new- 14-04-lockscree n/451451? noredirect= 1#451451