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What is the difference between GDM and LightDM? How can one switch between them. I mean if I have selected LightDM during installation process, will I be able switch to GDM?

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2 Answers

Both LightDM and GDM (GNOME Display Manager) are display managers.
They both provide graphical login capabilities (the GUI with the list of the system's users) as well as remote logins using the XDMCP protocol.

Ubuntu is supposed to officially replace GDM in favor of the lighter and more easily customizable LightDM

You can have both of them installed (or add even more, like KDM), but only one will be used at any time.

The default can be selected by running:

sudo dpkg-reconfigure gdm (if gdm is already installed)

More information on LightDM can be found on the Ubuntu wiki.

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they are not desktop managers: gnome, kde and unity are. GDM and LightDM are called login managers or display managers –  josinalvo Aug 15 '12 at 14:28
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error login page press (Alt+ ctlr +F1) to log in virtual terminal. In terminal type your login name(User name) and then type your password.

First thing you have to check that you have a access for the internet so type (ping www.google.com) if you received ping then your connected to the internet.if you not geting any ping from google then you have to first configure your ip setting to access the internet.

Then follow the step.

sudo apt-get install gdm

Type your password

after installation you will see the the window which show's you the graphic mode in that window select the gdm press ok

Then type

sudo reboot

type your password.

system will reboot and then you will access the system your problem is resolved.

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Whoa! What was the problem if this is the answer! ;) –  Jobin Dec 23 '13 at 15:51
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