sudo add-apt-repository ppa:gnome3-team/gnome3
sudo apt-get update sudo apt-get install gnome-shell
需要安装主题执行这一条；
sudo apt-get install gnome-themes*
删除unity:
sudo apt-get -y --auto-remove purge unity
sudo apt-get -y --auto-remove purge unity-common
sudo apt-get -y --auto-remove purge unity-lens*
sudo apt-get -y --auto-remove purge unity-services
sudo apt-get -y --auto-remove purge unity-asset-pool
设置默认登陆桌面；
sudo /usr/lib/lightdm/lightdm-set-defaults -s gnome-shell
如果默认进入gnome classic,执行以下指令；
sudo /usr/lib/lightdm/lightdm-set-defaults -s gnome-classic