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Questions tagged [display-manager]

A system's display manager (DM) is a graphical login manager. It is the program that starts the X server and user sessions, presenting the user with a graphical login screen (greeter). As of 11.10, the default display manager is LightDM; previously, GNOME Display Manager (GDM) was used.

The main role of a display manager on an X Windows system is to provide a graphical login, starting the X server (X Org in Ubuntu) and presenting a "greeter" (a graphical login screen), so that the user session starts with a GUI. Without a DM, the user would have to log in on a tty and then, if X Org is not configured to start on login, they would have to issue a command (such as startx) to enter the desktop environment.

LightDM is the default display manager in Ubuntu.

Related tags:

Wikipedia page on "X Display Manager"

263 questions
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How does the Display Server - Display Manager - Window Manager structure exactly work?

I would Like to know what exactly each does and how they are layered/structured or interrelated to each other, their functions, their interdependence, their communication protocols and when and why they interact and all that stuff! i would really…
Nirmik
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List all available display managers

How can I get the list of all the display managers installed in my Ubuntu laptop from the terminal?
M.Tarun
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Ubuntu is too big for my screen

I have just installed Ubuntu 13.4 on my desktop -- I am using a visio 32" tv as my monitor and have no problem with the screen size when windows is installed -- but with Ubuntu I can't see the icons on the top or bottom and the icons on the left…
user233290
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How do I run a application on top/in a display manager like GDM?

I was wondering if there is a way to run a application like Onboard on a display manager like GDM. If it depends on the display manager than please post the GDM instructions, or all of the popular display managers. The reason why I need Onboard…
MathCubes
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Ubuntu 18.04.2 LTS live - 2 Displays

I booted an Ubuntu live OS and wonder why my second Monitor shows up in the settings. I installed windows 10 on my harddrive which shows 2 Displays, too. The second one, an Acer V223W isn't even plugged so I wonder how Ubuntu can detect it. Can…
ahnungslos
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Running without a display manager

As I understand it the display manager asks you to pick an xsession and log in. I'm running icewm on Ubuntu 22.04 an old machine and just need it to start up and start icewm automatically -- no need for display managers or passwords. I've switched…
Richard Barraclough
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Command line to restart Gnome display manger

It happens to me from time to time on Ubuntu 20.04. The screen freeze and nothing seems to work. keyboard combinations like Alt-F2 , Ctrl+Alt+F4 are not responding. logging via ssh from another machine works fine and using htop I do not see any…
hans
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