Questions tagged [lightdm]

LightDM (Lightweight Display Manager) is a Display Manager for the X.org X server. It is the default X display manager of Ubuntu. LightDM starts an X session and presents the user with a graphical login screen, so the user does not have to issue commands such as `startx` to start the X server

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2 answers
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18.04 Error while booting. Hangs on line "stopping user manager for uid 123"

My sisters main computer is having major problems booting up and I cant quite figure it out. During boot it hangs on line "stopping user manager for uid 123". I have done both sudo dpkg-configure ...
1 vote
2 answers
2k views

lightm fail to start LXDE,but LXDE works with startx

I installed lxde on ubuntu server 16.04.3.every thing was fine untill i purged lxde and re-installed it.now i can start lxde with startx,but not with using lightdm or startlxde. In lightdm it says ...
0 votes
0 answers
13 views

Xorg screen detection for second seat

On my X11 kiosk system with two separate monitors assigned to a seat each, the second monitor cannot find a corresponding screen. Here my Xorg.conf. The Xorg.0.log detected the server layout assigned ...
0 votes
0 answers
54 views

Xubuntu 22.04.4 Slow desktop start after login (2-15 minutes)

I have problem and I need help with my Dell Inspiron 3525. The PC starts up correctly until the login screen. After entering my username and password and accessing it, I can see the wallpaper and the ...
6 votes
1 answer
4k views

Ubuntu 16.10 Mouse cursor stays in upper left corner

After crashing my Ubuntu 16.04 with installing nvidia drivers I installed Ubuntu 16.10 However my cursor is not moving anymore. It stays in the upper left corner. It is moving invisible (detected ...
1 vote
1 answer
76 views

raspi5 23.10 cannot switch to lightdm from gdm3

I've installed 23.10 on a Raspberry Pi 5 and it all seems groovy. The default display manager is gdm3, in line with the 23.10 current blessed GUI with the bar on the left and so on. (I don't know ...
73 votes
7 answers
325k 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)?
0 votes
2 answers
6k views

Ubuntu 15.10 hangs on "Starting light display manager" on bootup

I recently updated to 15.10, and now when I boot up, It gets stuck on "Starting light display manager" part of the boot sequence. I've purged and installed xorg, lightdm, nvidia drivers, all about a ...
0 votes
1 answer
13k views

No desktop appears after logging in using XDMCP

I just installed a test machine with Ubuntu LTS 14.04 and I went to configure the XDMCP access and found that the file /etc/lightdm/lightdm.conf is not there anymore. In Google I found that now it is ...
0 votes
1 answer
16k views

Ubuntu 16.04: display manager fails to start

Reposting the question from: https://unix.stackexchange.com/q/314129/193223 I recently upgraded from Ubuntu 14.04 to 16.04 after which the display manager stopped working. Assuming it's due to the ...
0 votes
1 answer
123 views

Delay after unlocking screen?

I'm running Lightdm on Ubuntu 22.04, and I've noticed that after I unlock my screen, my desktop appears, but it's completely frozen for about 15 seconds, which is frustrating. Before, in 20.04, I was ...
1 vote
0 answers
34 views

Multiple LightDM's

Relatively not long ago I had found out about different Display managers for Ubuntu and decided to try gnome. After that I wanted to go back to lightdm, and when I executed the command sudo dpkg-...
1 vote
2 answers
19k views

Login as domain user Ubuntu 14.04

I have installed PowerBroker aka Likewise-open on my Ubuntu 14.04 desktop. I successfully added the desktop to the domain but I am unable to login as a domain user at login screen. I found some ...
3 votes
3 answers
10k views

Ubuntu 16.04 Login Loop Problem

I have a problem with ubuntu. When I tried login, I was seeing a black screen and again login screen was coming. I tried some codes but they didn't work. Codes which I tried; chown username:username ....
8 votes
3 answers
5k views

Ubuntu 20.04 (Gnome3 / LighDM) > lock screen on suspend

It might be a [duplicate] but none of the answers I found work for me. brieucdug@sildenafil:~$ uname -a ; gnome-shell --version ; lightdm --version Linux sildenafil 5.4.0-31-generic #35-Ubuntu SMP Thu ...
0 votes
1 answer
5k views

Remove GDM Completely

I recently tried installing Gnome Ubuntu Desktop from here https://popey.com/blog/posts/my-ubuntu-1604-gnome-setup.html During the installation, I remember gdm3 asking me to set some kind of default ...
0 votes
0 answers
78 views

Ubuntu Server + lightdm + VNC != usbale Desktop. Don't know what i did wrong

I'm using ubuntu server 20.04 to run a standalone system, which hosts my automated tasks and zigbee gateway. The Zigbee gayteway uses software from "phoscon / deconz" [https://www.dresden-...
2 votes
2 answers
2k views

Cannot login to MATE for one user but not the other

Big disclaimer: Before this happened, I accidentally removed an important library (libreadline7), which has removed several important system libraries without me realizing (things like NetworkManager ...
4 votes
1 answer
10k views

Must manually restart lightdm to have it appear

I recently did an Ubuntu command-line install on my work laptop, then install Mate (core) and lightdm. I have an Intel graphics driver. When I turn on my computer, it boots to a black screen. Pressing ...
11 votes
8 answers
32k views

xhost setting at boot

I am able to set xhost at boot in Fedora by editing /etc/gdm/Init/Default and for example add: /usr/bin/xhost +local: How can similar be done in Ubuntu? I want that the /usr/bin/xhost +local: ...
0 votes
1 answer
46 views

Audio feedback loop on login screen

I use Lightdm and Cinnamon on Ubuntu 20.04 LTS. Every time the computer boots to the login screen, its microphone input is audible on its loudspeakers, so any noise I make (such as typing my password) ...
0 votes
1 answer
86 views

No Desktop after version upgrade

Thinks look dark! After doing a system upgrade from 22.04 to 23.04 my laptop displays a black screen, not even wallpaper. However, I can login via ssh. I've flailed about in ignorance and gdm.service ...
5 votes
2 answers
2k views

How-To limit user-names in LightDM login-screen when AccountsService is used

I have several "user" names in passwd that don't represent real people, and that should not appear on the LightDM login-screen. The lightdm-gtk-greeter configuration file clearly says that if ...
59 votes
7 answers
466k 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 ...
45 votes
6 answers
385k views

How do I kill the x-server?

Every time I try to kill the x-server, sudo service lightdm stop so that I can install the latest Nvidia drivers, I get an error message. stop: Unknown instance: What am I doing wrong?
14 votes
9 answers
43k views

Ubuntu 20.04 - Can’t log in after upgrade

I installed 20.04 (upgraded from 18.04) and cannot log in at all. I’ve tried changing my password using recovery mode, installing lightdm, and using Ctrl-Alt-F3. Strangely, when using Ctrl-Alt-F3, I ...
0 votes
1 answer
543 views

Lightdm + Cinnamon: Missing System Tray Icons

If I use gdm3, the problem does not appear, instead if I use lightdm, the problem appear until I restart cinnamon: How can I solve the problem? EDIT: I have installed these two in the following ...
0 votes
1 answer
3k views

remote display freezes & poor performance (x2go, XFCE, lightdm)

I have a server runnning Ubuntu Server 20.04 with XFCE4 (lightdm) and x2go. On the client side I use the x2go client for windows on windows 10. Since the client and the server are usually in the same ...
297 votes
46 answers
968k 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 ...
0 votes
0 answers
84 views

How to use other than null sink when running PulseAudio with lightdm in headeless mode?

I start PulseAudio like this: sudo -u lightdm /usr/bin/pulseaudio --daemonize=yes --log-target=journal with the intention to use it with mopidy.service: [Unit] Description=Mopidy music server After=...
573 votes
52 answers
1.3m 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 ...
2 votes
1 answer
212 views

Missing and leftover desktop manager sessions

After installing the various *ubuntu*-desktop packages, I had too many possible sessions, so I uninstalled all but the default (xubuntu-desktop in this case). However, the sessions had not yet gone ...
0 votes
0 answers
39 views

Lock screen bug Ubuntu 20 (Ctrl+Alt+F7)

I have discovered a bug in my Ubuntu 20 that I would like to fix, I have searched everywhere but I have not found any solution. The problem is that when I lock the session with the button in the upper ...
10 votes
3 answers
11k views

Disable screen locking with xubuntu 20.04 and lightdm

I just installed Ubuntu 20.04 and then installed xubuntu-core. When prompted, I chose lightdm as my login manager. I then disabled everything I could find related to screen locking, but I still have ...
4 votes
2 answers
1k views

Mouse cursor clicks on "wrong" screen

I use ubuntu (16.04) in a dual-monitor setup. When first set the screens position on unity control center, it didn't apply to all users and also didn't work on login screen. So I heard that it ...
1 vote
0 answers
79 views

Changing font styles of lightdm-gtk-greeter

I can change my font using the following option in lightdm-gtk-greeter.conf: font-name = ... But I'm not sure how to change the size or weight. I tried putting the following CSS in my GTK theme: #...
10 votes
6 answers
46k views

How to change lock screen background Ubuntu Mate

I would like to change the lock screen background in Ubuntu Mate 16.04. I have found out how to change the background for unity by changing the com.canonical.unity-greeter setting but I can not find ...
0 votes
0 answers
47 views

How do you lock the screen on suspend but not on hibernate when using lightdm's screen locker?

I want lightdm's screen lock to function on suspend but not hibernate, because I do not want to enter both a password to unlock the computer and the lightdm screen-lock password. This question has ...
35 votes
14 answers
113k 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 ...
2 votes
3 answers
1k views

No login screen after uninstalling lightdm

I did sudo apt-get remove lightdm After logging out I no longer get the login screen. Just a blank screen with a blinking cursor top left. Rebooting results in the same. I'd like to restore to the ...
0 votes
1 answer
133 views

What do I modify to stop light dm from starting at boot

I installed MATE and lightdm and then set them to to start automatically $ sudo systemctl set-default graphical $ sudo systemctl start lightdm $ reboot System is now stuck trying to start light ...
123 votes
8 answers
124k 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)?
1 vote
1 answer
463 views

How to boot up in kubuntu-mobile?

On Ubuntu 12.04 Unity I just did sudo apt-get install kubuntu-full kubuntu-mobile plasma-mobile The install finished with no problems and I see Kubuntu in lightdm as an option to boot into... but ...
1 vote
0 answers
19 views

LightDM showing wrong version on Kinetic

Ubuntu Kinetic, 22.10. (Will soon update to Lunar.) Originally 13.10, upgraded via LTS versions since: 13.10 -> 14.04 -> 16.04 -> 18.04 -> 20.04 -> 22.04. I use Unity because I like it. ...
0 votes
2 answers
105 views

Desktop login not allowed

Suddenly my Odroid mini PC with Ubuntu do not allow to login to Desktop. After I press Log In screen flashes with dark for one second and gets back without logged in. I found error in /var/log/auth....
0 votes
1 answer
163 views

Ubuntu Budgie 17.10 Greeter Wallpaper black

on my freshly installed Ubuntu Budgie 17.10 the greeter shows a black wallpaper instead of the out-of-the-box wallpaper. How can I set the greeter-wallpaper? I created a file /etc/lightdm/slick-...
0 votes
3 answers
7k views

gdm3 login loop, lightdm works in Ubuntu 20.04

A lot of people seem to have this issue, and many people have been able to fix it, but I have used every fix (besides reinstalling Ubuntu or creating a new user and moving stuff over) and have not ...
0 votes
0 answers
76 views

Lightdm display manager timeout error

In Ubuntu 18.04 using lightdm as a display-manager, but the status of the lightdm service is always activating and exactly at 90 Sec after service get started it was showing status=activating and ...
0 votes
0 answers
66 views

Black screen with underscore after ASUS logo while booting Ubuntu 22.04.2 LTS

I am using Ubuntu 22.04.2 LTS on ASUS Zenbook-N501VW. But when i try boot my system it shows a black screen with underscore (_) sign after ASUS logo. I have tried the solutions mentioned in this ...
0 votes
2 answers
601 views

Stuck in login loop, but only for one user

I was working on my Lenovo Idea Pad with Ubuntu when suddenly the screen froze, I could move the mouse and see the cursor moving, but clicking or pressing the keyboard keys had no effect, so I decided ...

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