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

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173
votes
31answers
293k views

Ubuntu gets stuck in a login loop

My Ubuntu is stuck in a login loop when trying to enter my desktop. When I login, the screen gets black and soon after that the login screen comes back. I've read that the problem might be caused by ...
188
votes
40answers
552k 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 ...
138
votes
12answers
111k 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
6answers
180k 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)? ...
48
votes
9answers
117k 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?
50
votes
9answers
118k 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?
46
votes
5answers
38k views

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

How do I hide a particular user from the login screen on a default install of 11.10 and higher? (ie. using Unity Greeter)?
18
votes
7answers
30k 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 ...
32
votes
13answers
61k 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 ...
29
votes
13answers
72k views

How to disable automatic login in LightDM?

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 ...
21
votes
6answers
40k 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 ...
16
votes
2answers
30k views

Remote login with graphical display manager (GDM, LightDM)

Is it possible to remotely (via ssh) make a login to GDM? I'll explain a situation in which I'd need this: I'm on my laptop and connect to my desktop via ssh. I realize there are some updates ...
22
votes
6answers
69k 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' ...
21
votes
3answers
19k 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 ...
38
votes
8answers
143k 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 ...
33
votes
2answers
36k 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?
14
votes
4answers
47k 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 ...
29
votes
5answers
17k 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 ...
33
votes
6answers
306k 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 ...
9
votes
9answers
5k views

Appearance does not change on switching the theme

If I select Radiance or Ambiance in the menu show in the following picture, my whole theme does not change. It only changes the title bar. How can I resolve this problem? Or how can I reset the theme ...
51
votes
1answer
15k 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.
23
votes
3answers
59k 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 ...
31
votes
4answers
71k 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 ...
21
votes
3answers
55k 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)?
7
votes
3answers
9k views

Laptop using 14.04 won't get past login GUI

My laptop was working perfectly yesterday, and now today I can't log in. At first, I was only getting a black screen. However, after following instructions in some questions here on AskUbuntu, I ...
77
votes
16answers
46k 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.
19
votes
1answer
10k views

Personalize monitor position before login

I'm using multiple monitors. When logged in everything I fine. Left monitor is positioned left and right monitor is positioned right, but before I login the login screen positions them the other way ...
12
votes
7answers
41k views

ubuntu 14.04 login loop problem

My Ubuntu 14.04 is stuck when trying to login my desktop. The screen goes black and soon after that the login screen comes back. I followed all steps in Ubuntu gets stuck in a login loop but the ...
12
votes
3answers
5k 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 ...
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 previous ...
31
votes
4answers
12k views

How do I remove the dots from the login screen?

I can change the background image that Unity Greeter 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 ...
8
votes
2answers
19k views

How can I replace LightDM with MDM?

Linux Mint Cinnamon 1.4 released with "MDM display manager". It is based on the code of GDM2.20. It provides: Graphical configuration tools Themeability Remote, automatic and timed login Event ...
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. ...
6
votes
5answers
10k views

How do I change the login manager's keyboard layout?

I have a netbook with an AZERTY layout. I've changed it to "bépo" to try it, but now I've reset it to a french layout. While all the apps have taken the change into account, Ubuntu's login manager ...
9
votes
1answer
5k views

How to make ubuntu 14.04 a kiosk [duplicate]

I have made a clean install of Ubuntu 14.04 LTS Desktop and now want's to convert it into a kiosk with a full screen webbrowser. This was previously done in 10.04 and worked perfect, but due to ...
0
votes
1answer
2k views

LightDM & SDDM fight on greeter screen

I had installed Kubuntu 15.04 sometime ago. I upgraded to 15.10, things were going fine till I added ubuntu-desktop to use Unity DE. When booting with systemd, on startup or login, I get black or ...
71
votes
1answer
98k 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?
12
votes
4answers
42k 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 ...
8
votes
9answers
23k views

Desktop login fails, terminal works

I have a freshly setup 12.04 LTS pc system (120 GB SSD, 1 TB HDD, 16 GiB RAM); since a few days, I can't login to the graphical desktop anymore: there is very short flashing shell window which ...
3
votes
3answers
4k views

How do I set the login manager to enable `change languages` at login?

How can I recompile the source to force the option to allow changing languages and keyboard layouts at login?
47
votes
1answer
8k 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 ...
10
votes
3answers
20k views

No password asked at login screen just start session button with LightDM

When I first installed Ubuntu I choose NOT to ask me for a password at login. That was ok for that moment cause it didn't ask me any password at login. But now I want to be asked for a login password. ...
11
votes
6answers
8k views

Can't get nVidia drivers working with 16.04, logs out right after login

I have installed Ubuntu 16.04 beta 2 on Monday, Apr 18th. When I try to install nvidia-current, nvidia-361 or the version that jockey installs, either lightdm fails to start entirely or I can't get ...
9
votes
1answer
34k views

How to change from GDM to LightDM?

I've upgraded to 12.04. My upgrade didn't go as expected; X crashed at the middle of the upgrade. I had to install many packages manually. This left me with a GDM login screen. How do I change from ...
5
votes
4answers
18k views

(13.04) lightdm crashing - black screen flashing cursor

I am using the 13.04 x64 release of Ubuntu on my PC and at least it works so far as it should. But suddenly the lightdm crashes during boot and even if I try to start it manually from terminal after ...
9
votes
3answers
26k 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 ...
8
votes
1answer
278 views

How to make indicator-sysmonitor as a default indicator on the login screen

The Ubuntu 14.04 currently have at the top right corner these indicators shutdown,lock button, calender time details, battery details, Input format (English) as the default indicators. Is it possible ...
4
votes
1answer
129 views

How can I run a local command (to run a script) on (just before) log out of a Unity session?

At the risk of posting a duplicate question: How can I run a local script (as the current user) when I log out? I read (and tried) among others: This one (Marton's version), which did perfectly ...
7
votes
1answer
10k views

Ubuntu 15.04 boot hangs on “Starting light display manager” after updates

I have recently taken the plunge to Ubuntu, and purchased the Dell XPS 13 Developer Edition. My first order of business was to wipe the "Dellbuntu" that came pre-installed and do a fresh install of 15....
6
votes
3answers
9k views

Unity greeter background not changing for users automatically after upgrade

I have recently upgraded from 11.10 to 12.04. Normal upgrade, no new installation. In 11.10 I was using Simple LightDM Manager tool to set a custom wallpaper on the login screen. This tool ...