I want to switch between unity and Gnome in the login screen. How should I do it.Is it possible to add any other interface like that in the lockscreen
2 Answers
As answered previously by Damian Here Installing Gnome Shell Desktop Enviroment
You may also Download and Install Via Software Center Gnome Shell Ubuntu Software Center
Just Install it like so
Open Terminal CTRL + ALT + T
then copy and paste the following
Use this commands (minimum installation):
sudo apt-get install gnome-shell
sudo apt-get install gnome-session
or simply this (normal installation):
sudo apt-get install ubuntu-gnome-desktop
Then log out and on the login screen there should be a new icon after the password field click this and select Gnome.
It has recently come to my attention that Gnome is unstable in Ubuntu and may cause issues with your system.

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you should mention that Gnome for Ubuntu is not stable, and definitely will cause many problems – Alex Jones Nov 12 '14 at 13:55
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Sorry next time I will do so. I thought since its in Ubuntu Software Center that it was stable. – Brandd Newman Nov 12 '14 at 15:26
I believe if you install gnome from a regular Ubuntu install (i.e. unity)
sudo apt-get install ubuntu-gnome-desktop
This should keep unity and have gnome available as an option, if I remeber correctly it's the icon which will have the current desktop environment icon, i.e. unity gnome, etc
I don't remember if it changes lightdm to gdm if you do it this way but if it does
sudo dpkg-reconfigure lightdm
that should reenable lightdm and have it as a default
I've been running GNOME exclusively for a while, but just switched the lightdm and gdm today due to a failed upgrade :/
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Thanks for your help.But I now see Gnome(flash back) and Gnome(metacity) which I donot use in my login screen.I wish to remove it.Can you suggest any method – Jayanth Kumar Nov 12 '14 at 11:23