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

learn more… | top users | synonyms

109
votes
36answers
281k 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 ...
39
votes
14answers
58k 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 ...
42
votes
14answers
33k views

How do I change the wallpaper in LightDM?

I would like to set the wallpaper in LightDM, how do I do that?
39
votes
5answers
103k 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)? ...
76
votes
12answers
59k 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!
36
votes
8answers
47k 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?
27
votes
8answers
53k 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?
17
votes
7answers
21k 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 ...
17
votes
2answers
11k 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 ...
18
votes
6answers
25k 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 ...
26
votes
5answers
9k 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 ...
7
votes
2answers
14k 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 ...
28
votes
4answers
15k 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)?
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 ...
7
votes
8answers
2k 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 ...
11
votes
4answers
28k 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 ...
17
votes
2answers
14k 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?
21
votes
6answers
66k 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 ...
13
votes
5answers
168k 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 ...
20
votes
7answers
25k 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 ...
3
votes
2answers
2k 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?
18
votes
13answers
33k 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 ...
43
votes
15answers
22k 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.
13
votes
5answers
26k 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' ...
12
votes
6answers
3k 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 ...
31
votes
1answer
8k views

What happens under the covers to log me in and start up the Unity Graphics 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.
8
votes
2answers
11k 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 ...
19
votes
3answers
24k 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 ...
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. ...
9
votes
3answers
28k 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
2k views

How do I remove the shutdown button only on the login screen?

I don't want anyone to be able to shut down my computer from the login screen. Can I remove the shutdown button at the top right corner of the login screen in Ubuntu 12.04?
2
votes
1answer
1k views

User Accounts not listed in System Settings User Accounts

I'm running 12.04 on PPC (IMAC G5) - but have a problem with creating/editing user accounts with the System Preferences User Accounts tool. All updates have been downloaded and installed. When I ...
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 ...
4
votes
1answer
13k 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 ...
3
votes
3answers
11k views

Ubuntu 12.04 Hangs On Login [closed]

Most of the time when I log in, I after I enter my password, it says login in, and nothing else happens.
12
votes
3answers
3k 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 ...
9
votes
2answers
8k 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.
11
votes
2answers
20k 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
1answer
2k views

How to change circular icon to indicate chosen session in unity-greeter?

In Precise (12.04), when I login to lightdm, using the unity-greeter, there's a white circle by my name. For the standard DEs like Unity or XFCE, the circle has a representative icon (Ubuntu symbol ...
7
votes
8answers
11k 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 ...
7
votes
3answers
6k views

LightDM is running but does not display on login

LightDM is installed and running by default as a part of the Beta release. Yet, LightDM is not displayed at login time, rather a primitive, GDM like manager is the one we find at login time. I tried ...
41
votes
2answers
48k 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?
14
votes
2answers
12k 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 ...
4
votes
1answer
1k 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 ...
6
votes
3answers
7k views

Virtual Terminal switching with a multiseat setup and lightdm

My aim is to have two seats for my Ubuntu machine. One of the monitors is a USB touchscreen from Mimo with a displaylink chip. I already got it working as main display just by reconfiguring xorg.conf. ...
2
votes
4answers
6k views

12.04: LightDM freezes while “Logging in…” - maybe due to deactivated login sound [closed]

good morning, lightdm freezes often after I entered my passwort. It hangs exactly saying "logging in...". It's no total system breakdown though. I found out that there is already an existing bug ...
5
votes
1answer
2k views

How to get the proper LightDM theme?

I've been using Oneiric since the second Alpha (had to, my new system refused to run any older Ubuntu version) and I've never been able to get the nifty LightDM theme I'm seeing everywhere. Instead, ...
1
vote
0answers
457 views

Ubuntu Opens in Black Screen Using Lightdm But Working When Using GDM

Last time I installed lm-sensor (a package to know CPU Temperature) and restarted my system. $ sudo apt-get install lm-sensors $ sudo sensors-detect $ sudo service module-init-tools ...
1
vote
2answers
10k views

12.04 Lightdm cannot login [closed]

I am experiencing a problem trying to login with lightdm: lightdm hangs after I insert password with message "loggin in". I've tried to restart it but the only workaround I've found is to reboot ...
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 ...