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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.

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Is one or another display manager really tied to DE? [on hold]

Several articles say that most of GUI DMs are used for a certain DE, e.g., GDM is for GNOME, LXDM - LXDE etc. And only LightDM is described as "cross-desktop" DM. I'm sure it doesn't mean that they ...
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Can't start GUI programs via command line due to wrong DISPLAY variable

I am using Ubuntu 18.10 and I cannot launch GUI programs via the command line. This applies to subl (for Sublime Text) and Firefox. When trying to start Firefox via CLI; it prints: Invalid MIT-MAGIC-...
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xdm black screen

I have Kubuntu 18.10 in which I installed XFCE. I wanted to use xdm as my display manager. So i installed it and I activated it using `sudo dpkg-reconfigure xdm" and selecting xdm as my display ...
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NVIDIA X Server Settings detected 2 displays even thought I only have one display

Settings inside the nvidia x server settings Display manager I don't even know how to describe this. I don't know what to do. My desktop background is "split". (image taken yesterday, before applying ...
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364 views

failed to start Light Display Manager

I am very new to Ubuntu. I am getting failed to start Light Display Manager error when I start Ubuntu. I am not getting login page. It might be possible that I have deleted Lightdm package. Can I ...
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Can we have a transparent HUD like image/information layer on display?

Sometimes I adore the HUD information or to have a favorite image picture on the front of the display layer (always on top and un-clickable). That would look like this and help our operation or just ...
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81 views

Unable to login after Ubuntu 18.04 fresh install

I downloaded the Ubuntu 18.04 .iso file and installed it. When booting the first time it asked me for my password, but when I entered the password at the login screen it rejected it three times and ...
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Ubuntu 18.04 resumes to login screen. Problems with display manager

I am using Ubuntu 18.04 with a GeForce GT 750. I had Cuda 9.1 and the nvidia-driver-396. I did an update to Cuda 10, which automatically installed nvidia-driver-410. After a reboot everything got ...
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Black screen from time to time at startup

I have installed Lubuntu 16.04 on Pipo X10 and have strange problem: from time to time screen goes black at certain moment at startup, looking as if it is offline. Everything works fine, I can connect ...
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How to pass the password to PAM like display managers do?

The question is how display managers like SDDM and GDM do expose the password typed by the user to PAM system? The reason why I want to understand that is that I want to unlock gnome keyring and ...
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How can I start an application on start up without the user seeing the login screen or the desktop?

I'm using Ubuntu on an up-squared board. The goal is to start a Python application on start up. The application needs to be immediately loaded without the user seeing the log in screen or any Ubuntu ...
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How to get displayed text location (in terms of pixels) on my screen?

I am trying to figure out if it is possible to read different words displayed on computer screen. For example in home folder (in GUI mode), we have Downloads, Documents etc. To display these words, ...
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280 views

GDM freezes when logging out in 18.04

I have recently done a clean install of Ubuntu 18.04. I have noticed that if I choose the 'Log Out' option, after logging out of the session, the GDM screen does appear, but there is no cursor, and I ...
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63 views

Automatically turn on monitor at certain time

When I lock my session, the monitor turns off after a while. How do I set it up so that the monitor are scheduled at a certain time (i.e at 8 am) to turn on to show the lock screen ? Ubuntu 18.04
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Ubuntu 18 screen updates are blocky/glitchy

I just upgraded my laptop from Ubuntu 16 desktop to Ubuntu 18 desktop. There were no display issues with U16. After the upgrade, and updating all available software, and after checking for additional ...
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1answer
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Ubuntu 16.04 Display Setting while Ubuntu 18.4 scalling is missing, Where is the Scalling?

Here I have Ubuntu 16.04 LTS and I can adjust the scaling. In 18.4 LTS the scaling is missing?????
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gedit cannot open display on ubuntu with Windows Subsystem

I'm completely new to ubuntu and am trying to get a text editor to open in a gui window. I'm on ubuntu 18.04 using the windows subsystem of Windows 10. When I call gedit, I get the following: arobiso@...
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Ubuntu 18.04 VNC/Vino stops refreshing when turning display off

After upgrading from 16.04 to 18.04 I'm having trouble with VNC/Vino. I can connect via VNC (by enabling the built-in 'Screen Sharing' option), but as soon as I turn of the local display (server is ...
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Ubuntu 16.04: Log in problem when using prime-select intel and adding /usr/lib/nvidia-396 to LD_LIBRARY_PATH

I'm doing some computation with my GPU (GTX 970) so I decided to use my integrated card from my CPU (i7-4790K) to display my 2 screens, hence I used prime-select intel to do so. In doing so it seems ...
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Ubuntu 18.04 not detecting new monitors

I recently bought two new monitors and i think ubuntu doesn't detect them. I had a dual monitor setup before this and it worked without problems. Neither my windows 10 partition or grub boot loader ...
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1answer
257 views

Set up dual independent monitors in Ubuntu 18

I have an nvidia quadro M2000 and Ubuntu 18.04 on a Dell Precision 3620 workstation. I need to run my two monitors separately. I can use the standard Ubuntu settings to extend my desktop onto the ...
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Second display (an old LCD) is very hazy on text. Can this be resolved?

I have an old LCD monitor (Dell Inc. 22'') that I am now trying to use as a second monitor to my laptop (Lenovo E460), running on Ubuntu. I would like to see if I can make this monitor less hazy/...
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No Displaymanager working, xserver behaves unreliably

I have an standard Ubuntu 18.04 machine running on a Thinkpad T430s. I use gdm3 as my displaymanager. Yesterday gdm3 stopped working. I installed updates, shut down the machine and the next time I ...
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After “security update” to 4.15.0-24-generic #26-Ubuntu screen shows log content not login [duplicate]

Ubuntu Bionic 18.04 SoftwareUpdater this morning installed updates including a new kernel version 4.15.0-24-generic #26-Ubuntu. Now when the system boots the screen displays the content of some log ...
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After installing Kubuntu, display manger fails!

When Installing Kubuntu on a 32-bit computer, why cant a fallback display manager be part of the final installation, do you how many times I have been left looking stupid when showing live disc of ...
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Loginloop in Ubuntu 16.04

For absolutely no reason ubuntu decided to prevent me from logging in suddenly. I cant login with my user, cant login with the guest user, cant login using ubuntu ui, cant login using gnome. I dont ...
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2answers
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Screen goes black

I am running "Ubuntu 16.04.4 LTS" on a desktop. Sometimes after running for a while the screen goes black and I can no longer access the computer locally. This includes alt-F1 etc.to get to a terminal ...
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1answer
481 views

Display Mangers didn't load after login screen in Ubuntu 18.04

I tried to install Xfce Desktop environment in Ubuntu 18.04 (gdm3 set as default). After installation rebooted the system, then on the login time select the Xfce as the display manager, but didn't ...
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120 views

Ubuntu 18.04 Logscreen graphical bug

I recently upgraded my Ubuntu 16.04.1 OS to 18.04 LTS, and noticed a small display bug at the login screen: When I close my computer's cover, the computer goes to sleep, so far everything is normal. ...
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34 views

Multiple Monitors Non-Standard Configuration

I have a Dell 7480 with Ubuntu 18.04, connected to a USB3 Docking Station to which are connected 2 monitors. My dilemma, getting All 3 monitors working, like in my Windoze configuration. Left - Right ...
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4answers
39k views

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

I ran into a problem this week, where I couldn't find a solution to. Everytime I start Ubuntu, it boots nominally, until it reaches "starting Gnome Display Manager" where the Konsole gets stuck and ...
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Change Desktop display manager [closed]

How do I change the Dell factory pre-installed display manager in 16.04LTS. I have the one I want already downloaded but settings doesn't give me a choice.
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1answer
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My ubuntu starts without unity

When I started Ubuntu this morning the login was different than usual. The user names were not provided as options, rather I had to type them which was very confusing (I never had to type my username ...
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2answers
4k views

Bootloop after upgrading to Ubuntu 18.04

I did sudo apt-get dist-upgrade -d today to get the new Ubuntu 18.04. While I was asked if I would keep the current display manager or take the one delivered with the distro the installation ...
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Mouse pointer does not work after update to Nvidia driver from x driver in Ubuntu 17.10

I changed the graphic driver to nVidia. Mouse pointer stopped working. I am able to login through key board but can't access anything else. Need help to change the display driver back to x at grub ...
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Primary display problem on multiple monitors leads to display on one screen, mouse on the other

I have two displays for my Ubuntu 17.10 machine; they are in the "Join Displays" mode. Intermittently, when I restart/login, I'll have the primary display switch to the other monitor, but the mouse/...
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1answer
2k views

How to check if the X11 display manager is installed?

I recently had some problems on sharing the screen on zoom, and I found out that disabling Wayland does the trick. It worked fine for my computer, but when I tried doing this on another computer, I ...
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Ubuntu 17.10: How to restore my deleted and currently enabled lightdm theme?

Everything works well yesterday. I have deleted my currently enabled LightDM theme using sudo in terminal because I thought it was the only way to remove the configuration of LightDM GTK+ Greeter ...
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2answers
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Is gdm3 preferred to lightdm?

I have hard a hard time finding good information on the performance difference between display managers on Ubuntu (specifically between lightdm and gdm3). With Ubuntu switching to Gnome, I would ...
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Two Gnome window managers w different displays?

I would like to have two window managers running where 3 displays allocated to one manager (personal) and 2 displays (rolling presentations) allocated to one manager. I am using Gnome. How can I set ...
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25 views

17.10 and gnome multidisplays resets

I have updated to 17.10 and now when I set my display order in the display manager and then reboot all resets to default and my monitors are not aligned well again. So I have to do it on each startup. ...
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1answer
1k views

How to boot Ubuntu 17.10 into a tty? (without loading gdm) [duplicate]

Following the advice from this question, I've tried to load Ubuntu without a graphics environment by replacing quiet splash in the grub boot script with text, and alternately by appending it to the ...
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Determine Whether the Display is On

What's the best way to determine whether the display is on in Ubuntu 17.10? I'm writing a program in Go and I want it to do more work when the display is asleep (i.e. power-saving mode) and less work ...
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1answer
51 views

Got stuck at /dev/sdaX: clean (accidentally removed display manager?)

I needed to free up some memory by removing a couple of i.m.o. unnecessary running stuff on my working Ubuntu 17.10… since I don't use snapd evolution-* gnome-calendar, I purged them and after reboot ...
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1answer
211 views

Do new installs of 17.10 have a “cog” at sign-in to choose display server?

I have 3 installations of 17.10. Two are upgrades from previous versions, which were done a month or so ago. These are vms on a Mac (MBP); one on Fusion and one on Virtualbox. These two installs ...
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How to make Gnome Blank Screen/Auto Suspend to LightDM

I have Ubuntu Studio 17.10 which comes with XFCE and LightDM preinstalled. I decided to install Gnome 3 but did not want to use GDM as I prefer LightDM. My problem is that now when I use my Gnome ...
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210 views

Second display(displaylink USB) not updating right in ubuntu 17.10

I'm still a bit new to Ubuntu, I've got an Asus MD169B+ USB monitor that uses the DisplayLink driver and I've got a 1050 ti in my laptop. After a bit of fiddling I've got the driver to work but now I'...
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134 views

Why is login screen different after waking from suspend?

I'm on Ubuntu 17.04. My login screen suddenly looks different now. Excuse the smudges. The laptop is worn out. As you can see, it now has an on-screen keyboard and a white window prompt for the ...
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1answer
211 views

Low resolution mode only after resume followed by login loop in Ubuntu GNOME 16.04.3 [duplicate]

This is my first Linux encounter. I have Asus ROG gl752vw, i7 6700, 16GB RAM 128 GB SSD, 1 TB HDD nvidia geforce 960m 4GB machine preinstalled with Windows 10. I installed Ubuntu GNOME 16.04 with ...
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2answers
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Black screen after installing XDM on ubuntu… and I lost all of my settings

I'm on Ubuntu 17.04 and I recently installed the xdm package by accident, thinking it stands for Xtreme Download Manager. Now I have a black screen on Ubuntu. Before I log in, a window appears and it ...