I tried to update my gnome 3.12 to 3.14 with four commands in the terminal but after rebooting only black screen came out, there is no gnome 3.14..... I have to work from tty1, what is wrong with it
sudo add-apt-repository ppa:gnome3-team/gnome3-staging
sudo add-apt-repository ppa:gnome3-team/gnome3
suod apt-get update
sudo apt-get dist-upgrade