Skip to main content
163 votes
Accepted

What is gdm3, kdm, lightdm? How to install and remove them?

gdm3, kdm, and lightdm are all display managers. They provide graphical logins and handle user authentication. From a Wiki article,: A display manager presents the user with a login screen. A session ...
Anwar's user avatar
  • 77k
46 votes

How do I switch from LightDM to GDM?

For newer versions of Ubuntu I had to use gdm3 instead of gdm: sudo dpkg-reconfigure gdm3
dessalines's user avatar
45 votes
Accepted

Can't switch to gdm3 using sudo dpkg-reconfigure gdm3

re: sudo dpkg-reconfigure gdm3 error message. Just reboot and you should be running gdm3. The error that you're receiving just means that gdm3 wasn't already running, so it couldn't reload it.
heynnema's user avatar
  • 71.4k
41 votes

Ubuntu 18.04 stuck in boot after starting Gnome Display Manager on Intel Graphics

I had the same problem after installating 18.10 on my Thinkpad T430s where Nvidia drivers were installed. Doing a sudo apt-get remove --purge nvidia-* inside the recovery mode root shell solved the ...
Stefan Bremer's user avatar
29 votes
Accepted

Is gdm3 preferred to lightdm?

GDM is the default DM in Ubuntu as of 17.10. LightDM is still the default for some other flavours, like Xubuntu or Lubuntu, and I doubt either of these projects will move to GDM, so LightDM should ...
muru's user avatar
  • 201k
28 votes

Wayland in Ubuntu 20.04 (IntelGPU)

After doing much searching of the internet I have come up with this solution. This solution will enable Wayland even if you have proprietary NVIDIA drivers on Ubuntu 20.04. Execute sudo apt install ...
austanss's user avatar
  • 380
22 votes

Can't switch to gdm3 using sudo dpkg-reconfigure gdm3

Use this sudo dpkg-reconfigure lightdm in place of sudo dpkg-reconfigure gdm3 this and then choose gdm3.
Vardaan Shukla's user avatar
20 votes

Is gdm3 preferred to lightdm?

gdm3 has an annoying bug for Nvidia Optimus users not using wayland. If you run your nvidia driver kernel modeset (modeset=1), you enable "prime sync" which means you no longer have tearing on your ...
Tim Richardson's user avatar
15 votes

How do I switch from LightDM to GDM?

In addition to the other answers, to use gdm3 and stop lightdm on Ubuntu 18.04 I had to run: sudo dpkg-reconfigure gdm3 systemctl stop lightdm systemctl start gdm3
Sophia Marie's user avatar
14 votes

What is gdm3, kdm, lightdm? How to install and remove them?

Lightdm, gdm3, and kdm are all graphical logins for linux. Lightdm is the default for Ubuntu. To switch between display managers, use the following command: sudo dpkg-reconfigure lightdm And choose ...
negusp's user avatar
  • 2,831
14 votes
Accepted

What's the difference between desktop managers and display managers?

Display manager Is a graphical user interface that is displayed at the end of the boot process in place of the default shell. There are various implementations of display managers: GDM — Gnome ...
kyodake's user avatar
  • 15.5k
14 votes

Ubuntu 18.04 stuck in boot after starting Gnome Display Manager on Intel Graphics

got same kind of gdm3 not responding (no greeter) after an upgrade to 18.04, from 17.10, on a i386 machine (namely, a very old MacBook) with Intel graphics. I still could access it by SSH, but no ...
N. Chartoire's user avatar
13 votes

How can I disable all display managers?

Assuming your distribution uses systemd, systemd's default target is graphical.target. You can check the default with: systemctl get-default You can change the default to multi-user.target with: ...
Nick Breen's user avatar
13 votes

Is gdm3 preferred to lightdm?

Ubuntu GNOME uses the gdm3, which is the default GNOME 3.x desktop environment greeter. As its name suggests LightDM is more lightweight than gdm3 and it's also faster. LightDM will continue to be ...
karel's user avatar
  • 117k
12 votes
Accepted

Unable to share entire screen

From: Google Community Edit /etc/gdm3/custom.conf Uncomment #WaylandEnable=false sudo dpkg-reconfigure gdm3 ctrl + alt + backspace or just reboot
rpvilao's user avatar
  • 246
11 votes

Ubuntu 18.04 stuck in boot after starting Gnome Display Manager on Intel Graphics

After upgrading my system to linux-image-4.15.0-24-generic, I experienced this issue where boot hangs at either started dispatcher daemon for systemd-networkd.ce or Started Gnome Display Manager.... ...
Lester Obbayi's user avatar
10 votes
Accepted

Which display manager is used by default in Ubuntu GNOME 16.04?

Ubuntu GNOME uses GDM as its default display manager. This can be verified by looking at the dependencies for the ubuntu-gnome-desktop package, which include gdm3 but not lightdm. http://packages....
Nick Weinberg's user avatar
9 votes

How can I find out my greeter name

The greeter (screen) is provided by the display manager. Assuming you are using X server (not Wayland, Mir or others), you can find your default display manager from the file /etc/X11/default-display-...
heemayl's user avatar
  • 92.3k
8 votes

How can I disable all display managers?

Run these steps: Edit your grub $ sudo gedit /etc/default/grub Change from: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" Change to: GRUB_CMDLINE_LINUX_DEFAULT="text" Update Grub with $ sudo ...
L. D. James's user avatar
  • 25.1k
8 votes

Wayland in Ubuntu 20.04 (IntelGPU)

In my case: I'm running Ubuntu 20.04.1 with NVIDIA driver metapackage from nvidia-driver-455 (open source). I did not have to install the gnome-session-wayland package. I commented out all lines in ...
Bucephalus's user avatar
7 votes

Cannot enable Unity Plugin in ccsm

I encountered a similar problem today and none of the usual fixes were working for me either. I eventually was able to resolve it by right clicking on the desktop then clicking on "Open Terminal" ...
MttJocy's user avatar
  • 692
7 votes
Accepted

Strange graphics issues such as flickering application windows and inconsistent display lagging

The -49 and -50 kernels are flawed, and have been withdrawn. There are graphics issues (possibly only with internal Intel video subsystems). Boot your computer. At the GRUB menu, select the 2nd choice,...
heynnema's user avatar
  • 71.4k
6 votes

Reconfigure the display-manager non-interactively

After reading up the .post*, '.pre*' and .config scripts of gdm3 and lightdm I have found a way to run dpkg-reconfigure interactively to change between the display managers and keep the magic of the ...
Thomas's user avatar
  • 6,253
6 votes

Turn off display in Ubuntu on Wayland

In Wayland (and Xorg), you can activate the screensaver if that is set to blank the screen: dbus-send --session --dest=org.gnome.ScreenSaver --type=method_call \ /org/gnome/ScreenSaver org....
vanadium's user avatar
  • 91k
5 votes

Why little yellow tint on display?

Anyone finding this who is running Ubuntu 18.04. I had the same problem with a dull, yellow hue to my display. This was resolved by navigating to Activities -> Search for 'color' -> Select Color ...
RgnKjnVA's user avatar
5 votes

How to check if the X11 display manager is installed?

To see if you have x11 installed, simply run this command from a terminal: dpkg -l | grep xserver-xorg-core and if you get something like: ii xserver-xorg-core 2:1.19.5-...
marko's user avatar
  • 928
5 votes

After "security update" to 4.15.0-24-generic #26-Ubuntu screen shows log content not login

Hey I just had the same problem. I didn't investigated but I think the problem is GDM and maybe the kernel. A quick workaround I use: (Re-)start computer. Press Shift till you get the Grub menu. ...
Eugen M's user avatar
  • 216
5 votes
Accepted

What's the replacement for lightdm service in Lubuntu 20.04

It is sddm sddm is the default display manager that shows up when you first log in to Lubuntu or logout or choose to another session. There is no graphical application to do this currently. ...
Organic Marble's user avatar
4 votes

Tried to disable guest account and now Ubuntu isn't working

I suppose that /etc/lightdm/lightdm.conf didn't exist previously, so now you have an incomplete configuration file. This is what I suggest: Try to open a TTY terminal using Alt+Ctrl+F1. Type your ...
Gunnar Hjalmarsson's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible