LightDM (Lightweight Display Manager) is a Display Manager for the X.org X server.

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126
votes
37answers
365k views

How to fix “The system is running in low-graphics mode” error?

Note: This is an attempt to create a canonical question that covers all instances of "low-graphics mode" error that occurs to a user, including but not limited to installation of wrong ...
94
votes
12answers
80k views

How do I disable the guest session?

How do I disable the guest session in Ubuntu 11.10 or higher? I don't want people to be able to use my computer without using a password to log in!
64
votes
16answers
95k views

Ubuntu gets stuck in a Login Loop

My problem: As you can guess my Ubuntu is stuck in a login loop when trying to enter my desktop. Means the screen gets black and soon after that the login screen comes back. I'm a Ubuntu Newbie so if ...
51
votes
15answers
30k views

How do I disable the drum beat sound on the login screen?

I would have expected System ▸ Administration ▸ Login Screen ▸ Play login sound to control this, but unchecking it does not prevent the drum beat sound from playing.
51
votes
2answers
62k views

What's the difference between GDM and LightDM?

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?
46
votes
5answers
127k views

How do I change the default session for when using auto-logins?

When autologon is active, lightdm will start the Unity 3D session, not the 2D (or any other shell that I want to auto-login to). Is there a way to start the shell I want automatically (autologon)? ...
40
votes
9answers
65k views

How do I enable auto-login in LightDM?

I want user foo to auto-login using LightDM (which has been used by Ubuntu since version 11.10). How would I do that?
38
votes
1answer
10k views

What happens under the covers to log me in and start up Unity or another Graphical User Interface?

When there's trouble, it might be good to understand what happens under the covers to sign a user into a GUI session and get a Unity (or other window manager) to bring up a desktop.
32
votes
9answers
69k views

How can I make xrandr customization permanent?

I used to edit the startup script for the GDM (/etc/gdm/Init/Default) to permanently change my display resolution. How can I do this with LigthDM in Ubuntu Oneiric?
32
votes
4answers
21k views

How do I hide a particular user from the LightDM login screen?

How do I hide a particular user from the login screen on a default install of 11.10 and higher? (ie. using LightDM)?
28
votes
4answers
9k views

How do I remove the dots from the lightdm greeter?

I can change the background image that LightDM displays, but regardless of the image I choose, it's overlaid with a grid of dots. The dots look OK on the default background, but they look horrible on ...
27
votes
5answers
88k views

How to change the LightDM theme/greeter?

I downloaded a couple greeters for LightDM, but I have not figured out how to enable them. Is there a way to switch greeter, either by graphical or command-line method?. I do not intend to change ...
26
votes
5answers
11k views

How to make the lock screen look like the login screen?

Is there any way to make the login screen from a locked session (either by using Ctrl+Alt+L or from a screen timeout) look like the login screen when you're starting a new session? I hate that ...
23
votes
1answer
3k views

What is the relationship between Unity, Gnome, Gnome 3, Compiz, Metacity, and LightDM?

I am learning about Graphical User Interfaces in Ubuntu and constantly come across different terms, which cause a lot of confusion for me. I have tried reading easy-to-understand tutorials about the ...
22
votes
9answers
34k views

Wrong Login Screen Resolution

Excuse me if this has been answered already, but I couldn't find any questions quite matching my issue. On the odd occasion, usually after incorrectly restarting my computer, my login screen ...
21
votes
2answers
20k views

How can I make LightDM the default display manager?

I have LightDM installed and can start it with sudo start lightdm. But at boot, GDM is still the default. How can change this so LightDM is loaded automatically at boot instead of GDM?
20
votes
6answers
30k views

Cannot login to my user account

I upgraded my ubuntu from 11.04 to 11.10 via mounting the latest alternate CD image released on Oct. 13 as the final standard version and running the cdromupgrade prompt successfully, with full latest ...
19
votes
3answers
32k views

Lightdm not starting on boot

I installed gdm for a while as my display manager, and after removing it, lightdm does not start by itself. I instead have to login to a tty, and run sudo start lightdm. Running dpkg-reconfigure ...
18
votes
13answers
44k views

How to disable automatic login?

I was playing around with "User accounts" and somehow set automatic login. Now, when I start my PC, it just has one button named as "login". Clicking that button, directly logs me in to my PC. There ...
18
votes
2answers
3k views

Is there a way to shut off showing the user's wallpaper in Lightdm?

I don't want to expose my wallpaper to other people who share my computer, is there a way I can disable this feature or work around it?
18
votes
3answers
10k views

Where is the user's profile picture stored in Gnome 3?

In Ubuntu 11.10, I can set my profile picture through the User Accounts settings panel. I can select an existing picture and it will help me crop that picture to look nice. The final product is not ...
17
votes
5answers
204k views

How does one exit the X server?

The command sudo service gdm stop would successfully disable the X server in Ubuntu 11.04 temporarily. However, this same command no longer works in Ubuntu 11.10, because "gdm" is an "unrecognized ...
17
votes
3answers
13k views

How to remove session entries from LightDM?

I recently added Cairo Dock to my GNOME Shell in 11.10. Cairo Dock is GREAT, but I'm left with one little problem that I'd like to fix: after installing Cairo Dock, LightDM includes two extraneous ...
17
votes
7answers
24k views

How do I add customized wallpapers so they appear in the dynamic unity greeter?

As the title above suggests I want to add some custom wallpapers (png images I have created myself) to the user/share/backgrounds folder in 12.04. I have completed this task. Issue : They do NOT ...
16
votes
1answer
24k views

How do I make GDM the default display manager?

I believe my question says what I am trying to achieve. Steps I tried to make gdm my default display manager: sudo dpkg-reconfigure than select gdm as my default. Edit ...
16
votes
2answers
6k views

.xsession. .xinitrc, xmonad, and lightdm

Let me preface my question with the following: I am pretty sure that I can hack together a solution by modifying /usr/share/xsessions/somesessionfile.desktop and make it run /etc/X11/Xsession, and get ...
16
votes
5answers
36k views

After logging in, there's a black screen and my cursor, nothing else! in Ubuntu 12.10

I've been using Ubuntu(12.10) for a long time, and recently, my Ubuntu went through yet another update. The whole update prompt showed up, following by a password prompt, and finally the good ol' ...
15
votes
2answers
14k views

How can I use LightDM for user-defined sessions?

If I unterstand it correctly, LightDM has replaced GDM per default. I wonder if it's possible to make it run the things I put in my .xinitrc file ... what I need is an option below "Unity" and "Unity ...
13
votes
2answers
27k views

How do I switch from LightDM to GDM?

How do I switch from the default display manager (Lightdm) to the older display manager (GDM)?
13
votes
3answers
26k views

How to configure lightdm to allow manual logins in Ubuntu 14.04

I used to modify /etc/lightdm/lightdm.conf, adding the line greeter-show-manual-login=true, in order to allow login for hidden users and root. Now I've just installed the new Ubuntu 14.04 and the ...
13
votes
0answers
21k views

How do I boot into console mode? [duplicate]

In previous versions of Ubuntu I could get the computer to boot into console mode by setting the variable GRUB_CMDLINE_LINUX_DEFAULT to "text" in the file /etc/default/grub and run sudo update-grub. ...
12
votes
4answers
33k views

How to force Multiple Monitors correct resolutions for LightDM?

I am affected by the BUG: https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/874241 Otherwise, if like me you have a laptop connected to a second monitor of higher resolution, LIGHTDM at the ...
12
votes
1answer
23k views

How do I configure lightdm to work with XDMCP?

Does anyone have a set up to make xdmpc work with lightdm on 11.10. Using xdmpc+gdm was easy as pie, worked great. After the upgrade to 11.10 with the switch to lightdm I can't figure out how to get ...
12
votes
4answers
12k views

How do I set my own (HTML) theme in LightDM?

LightDM is the new login manager, and is meant to be themeable using HTML and CSS. How do I do that in Ubuntu 11.10? Can I use my own HTML file with my own text? Things I've tried: I've spent a ...
12
votes
3answers
4k views

Where do I place a logout script for LightDM?

Previously in Karmic, we created a logout script that does some work in the background on backing up a users home directory, this script was put in the /etc/GDM/PostSession directory. I can't figure ...
12
votes
6answers
4k views

Why does LightDM only show a custom wallpaper on the login screen if I have selected one of the default wallpapers? [duplicate]

Possible Duplicate: How do I add customized wallpapers so they appear in the dynamic unity greeter? LightDM only changes wallpapers if I have selected one of the default wallpapers. If I ...
12
votes
3answers
3k views

Stop laptop from suspending when closing lid in lightdm

How do I stop my laptop from suspending when closing the lid under lightdm - the power management settings in xfce or gnome 3 does not seem to apply when the window manager is not running.
11
votes
1answer
996 views

How can I enable a face browser in LightDM?

Is there a way to enable face display in the default LightDM greeter in Oneiric? If not, is there another alternative greeter that supports faces? (I know I can switch back to gdm if necessary, but ...
11
votes
0answers
5k views

How do I stop or start the desktop from loading on bootup? [duplicate]

I occasionally want to use my Ubuntu machine as a desktop but mostly as a headless file server. Before I upgraded to Oneiric, I used rcconf services to disable or enable the desktop. In Oneiric I ...
10
votes
2answers
10k views

How do I install KDE and retain LightDM as a login manager?

I want to install KDE in my Ubuntu 12.04 . I am using LightDM. So how can I fully install KDE? I do not want to remove LightDM. I want KDE but without any confliction with it.
10
votes
1answer
898 views

What is the “Other” account in LightDM?

I use Ubuntu Oneiric and I would like to know what is the account named Other for? It does not appear in the user manager. How can I remove it?
10
votes
1answer
861 views

Why use a Display manager?

I'm currently trying to free as much memory as possibile because I'm using my laptop for scientific simulations. One of the things I made is disable gdm and using login+startx to start GNOME session. ...
10
votes
0answers
5k views

How to disable login sound? [duplicate]

Possible Duplicate: How do I disable the drum beat sound on the login screen? How do I disable the login sound? I have tried all guides on the internet I can find, but they are for ...
9
votes
3answers
33k views

How do I enable the “Other” user for login with Active Directory?

So I work at a university using active directory, and in my office there are a few computers that I've set up, in Ubuntu 11.10, to log as an AD user. In order to log in a person just needs to use ...
9
votes
2answers
16k views

Don't list all users at login with LightDM

I just upgraded to Ubuntu 11.10 and I was wondering if it's possible to not list all the current users and instead require the user to type in their username? My company's IT policies require that ...
9
votes
1answer
12k views

Can I replace the default login screen for the Pantheon Greeter?

I'm using Ubuntu 12.04, and I'd like to know if I can replace the default login screen (Light-DM) for the one used on ELementary OS (Phantheon Greeter). If possible without installing the rest of the ...
9
votes
3answers
16k views

Run a startup script with lightdm

I have a tablet PC and the graphics driver doesn't support xrandr, so in order to rotate the screen I run a script which changes the Xorg.conf file and then restarts lightdm. I also have a script ...
9
votes
2answers
1k views

Is it possible to use LightDM in 11.04?

O we know 11.10 will use LightDM instead of GDM. My question is can I use it in 11.04 already or would that not be advisable?
9
votes
1answer
6k views

Why don't my lightdm.conf edits affect my desktop screen resolution?

I wanted to change my desktop screen resolution to 1366x768. But my VESA drivers(AMD REDWOOD) did not detect that resolution. So I created a shell script as follows:- xrandr --newmode ...
9
votes
1answer
445 views

What keys can I use to navigate Unity Greeter with a keyboard?

I have a media center with a keyboard but no mouse. Is there a way I can navigate the Unity Greeter with a keyboard so I can change the session I log into, etc.?