It’s not commended to enable and login as root user in Ubuntu Linux. sudo command can do most works if you need super user privilege. But if you do need or have a good reason to login Ubuntu as root, here’s a way to login root via LightDM. Do it at your own risk!
Since Ubuntu 11.10, the default display manager was changed to LightDM.
In Ubuntu lightdm log-in screen, guest session can be logged in without a password. Although guest gets lower privilege and can’t run sudo command, you can remove it from login screen via following way.
Edit LightDM configuration file “/etc/lightdm/lightdm.conf”. This need root privilege, use sudo nautilus command to start file browser with super user.
I’ve written a tutorial about enable numlock lamp on Ubuntu login screen. It’s convenient when typing numbers while at login.
Lightdm is displayed properly but after entering a password and clicking login, I see the screen blink and lightdm window re-appears and asks to log in as if nothing happened.
Configs
user@laptop:~$ cat /etc/lightdm/
lightdm.conf lightdm-gtk-greeter-ubuntu.conf
lightdm-gtk-greeter.conf users.conf
lightdm.conf
user@laptop:~$ cat /etc/lightd
This simple tutorial is going to show you how to remove the white dots in LightDM login screen in Ubuntu 12.10.
If you have already installed the Ubuntu Tweak, navigate to Tweaks -> Login Settings -> unlock -> turn off draw grid.
Alternatively, hit Ctrl+Alt+T, copy and paste following commands into terminal and run one by one.
Allow user lightdm to create a connection to the X server:
sudo xhost
This simple tutorial will show you how to hide a particular user from Ubuntu 12.04 Precise’s LightDM login screen.
1. Open terminal from the dash or press Ctrl+ALt+T.
2. Execute this command to edit the /etc/lightdm/users.conf file.
sudo gedit /etc/lightdm/users.conf
3. Add the user name to the end of this line.
I installed Ubuntu mini 12.10 and then I did apt-get install lxde-core lightdm-gtk-greeter.
I successfully changed the LightDM screen resolution editing the /etc/lightdm/lightdm.conf and adding display-setup-script=xrandr -s 1280x720.
How to add an image for the power and settings icons in the lightdm-gtk-greeter screen? Right now, it looks like this:
I'm trying to create my own Ubuntu LiveCD without Unity. When lightdm loads is says (Failed to load session "ubuntu"). The autologin fails and then lightdm reloads with a normal login screen.
I can login fine with ubuntu user and if I run "sudo x-session-manager" I still get the error message (Failed to load session "ubuntu").
LightDM the new display manager for Ubuntu 11.10 Oneiric, comes to replace the old GDM, LightDM is known as a ligher and more customizable one.With the arrival of Ubuntu LightDM 11.10 Oneiric also came many new mockups, one of them was made famous by Robert Handmaids, a Canonical developer who created a 3D animation of the LightDM.