Delete unity after gnome is installed on Ubuntu

This article is transferred from: liuze's blog

Unable to accept the instability and operation innovation of unity. After upgrading to 12.04, the system will delete unity and switch back to the classic desktop.

1. Install gnome
3

Sudo
Apt-Get install gnome-shell

Sudo
Apt-Get install gnome-tweak-Tool

Sudo
Apt-Get install gnome-themes *

(Or a simple choice
Sudo apt-Get install gnome-themes-Standard)

If you want to log on automatically, you can do the following:

Automatic logon to Gnome
Shell classic:

Sudo
/Usr/lib/lightdm-set-defaults-s gnome-classic

If you like gnome3

Sudo
/Usr/lib/lightdm-set-defaults-s gnome-shell

2. Delete 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

Note: unavailable
Sudo apt-Get -- auto-Remove purge unity *. Check that many of the software package lists are not related to unity.

And
Unity-greeter must be retained.