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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Upgrade to 21.04 - Graphic login problem + Fail to start Service for snap application … livepattch

I am not an advance user of Ubuntu, using an old HP Envy Dv7 laptop. I am happy that finally I can upgrade my Ubuntu from 20.10 to 21.04 last night. The installation runs smoothly. Once my computer ...
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fresh ubuntu 16.04 machine on cloud stuck at login page with teamviewer (already reinstalled lightdm, folder permission are updated) [closed]

First of all, I personally think that the issue is irrelevant to teamviewer I have a ubuntu 16.04 machine from huawei cloud and installed ubuntu-desktop I further installed teamviewer and added a user ...
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LXDM on 20.04 fails to start

Since LightDM decided to drop multiple session support (the machine I'm using has a single dual-head video card so dual-seats isn't really optimal for me), I decided to drop Unity, which I had ...
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Strange graphics issues such as flickering application windows and inconsistent display lagging [duplicate]

My computer was acting really strange; the windows were flickering and parts of windows of different applications were partly appearing at random places. Also when I was typing, my computer seemed to ...
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Ubuntu 20.04 screen flickering after power loss

I had Ubuntu 20.04.02 LTS installed on my work machine for months and it worked without any problems. Yesterday the power suddenly went out in the office. After it came back and rebooting the machine, ...
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How to switch the display manager to tbsm?

How to switch the display manager to tbsm? I just installed tbsm display manager from their source, but I don't know how to switch to it, I know I can go to lightdm with dpkg-reconfigure lightdm but I ...
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Desktop (dual boot with windows) with AMD GPU upgraded from ubuntu 18LTS to 20.04 LTS breaks login GUI

I made the mistake of upgrading from ubuntu 18 LTS to 20.04 LTS not knowing there are (login) issues with 20.04. My computer has an AMD GPU dual boot with windows ~5 gigabytes of space left available ...
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lightdm does not switch back to gdm

Hello i am using ubuntu 20.04 and i tried lightdm but i did not like it so i wanted to switch back to gdm3 using the command sudo dpkg-reconfigure gdm3 then before restarting i used the command cat /...
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Detecting screen recording event of screen recorders by monitoring xlib function calls?

Many resources online such as this and this point to the fact that screen recorders do not make any system calls to capture the screen. so how does a screen recorder capture the screen ? i came ...
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How to disable the “screen locking disabled” notification in gnome 3.38?

This message pops up after every login, this started happening when I removed the desktop icons gnome extension - DING https://extensions.gnome.org/extension/2087/desktop-icons-ng-ding/ (I'm using ...
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How do I switch between users, without logging out?

I am using Lubuntu, my desktop environment is lxQt and screensaver is xScreensaver. I'm trying to figure out a way to switch between users, (e.g. when pressing Meta + L). Even though, it is possible ...
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How do I connect Ubuntu 20.04 to a Smart-TV?

how do I connect my smart TV to Ubuntu (20.04 LTS) as secondary display? Cant find any option anywhere .. Thanks for helping! Achim
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Remembering Screen Brightness at Display Manager/Startup

With using linux on and off on different PC's through the years, one issue I have not been able to solve is the brightness setting during boot sitting at the Display Manager. I am running KDE version ...
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Prevent mouse from leaving screen

I would like to prevent my mouse from leaving the current screen it is on after pressing a key combination. (Multiscreen setup) On Windows, this can be accomplished by DualMonitorTools where one can ...
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How to set HDMI output exclusively to audio and prevent it from recognizing it as a display?

I have connected my Ubuntu 20.4 desktop computer with my av-receiver to get audio output via HDMI to my sound system. This is working, but it has the side effect, that my av-receiver is also ...
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Ubuntu 16.04 VMWare: How to make the display full-screen?

How can I change the screen resolution Ubuntu 16.04 in a VMware to view it in full-screen mode to utilize / cover the black space? I have used the VMware stretch option but it's not useful.
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applications have a different theme when run as root in lightdm

I changed lightdm's default theme and icon set to Flat-Remix-GTK-Dark and Flat-Remix-Green-Dark respectively. which looks like this: problem is when I run programs as root, which then they seem to ...
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Getting issue with display on Ubuntu 18.04.4

While running docker for scraping/splash, I kept getting notification of "Empty Trash" which indicated that the disk was out of space. After few seconds,GUI got stuck. I powered of the ...
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Kubuntu 20.04LTS on Acer Aspire A515-43-R19L not displaying properly until I log out and back in

I just bought the A515-43-R19L Acer Aspire 5 laptop and went to install Kubuntu. I added a SSD to the laptop which has Kubuntu installed, the Windows 10 installation is still installed in the built in ...
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Fake video driver on an headless Ubuntu 20.04 server

I Installed a headless 20.04 Ubuntu server with xubuntu-desktop and tightvncserver on a RPi4. I want to be able to connect to it with Remmina. Thus, I installed xserver-xorg-video-dummy and configured ...
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Ubuntu 18.04 stuck in tty

I'm not able to start my GUI. I exited from some server via exit command after which I restarted my computer and then it moved to tty console. error after restarting I tried following solutions: ...
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LightDM theme is not acting normal

fellow Ubuntu Enthusiasts! I recently installed LightDM via sudo apt install lightdm and then installed lightdm settings tool via sudo apt-get install lightdm-gtk-greeter-settings And now, LightDM ...
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Troubleshoot Ubuntu 20.04 display freezing

Display on Ubuntu 20.04 has been freezing at apparently random moments. Machine under no memory or CPU pressure. Mouse moves, but no input accepted from mouse or keyboard. I have tried: Restarting ...
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content on all 4 sides of my Sony TV are cut off when connected via HDMI to be a second monitor

I have connected a sony TV to my laptop through HDMI port to use as a second monitor. But, content is being cut off on all four sides are cut off like shown in images below: top-left: bottom-left ...
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Can I adjust the White Balance/Color Temperature (hardware) settings of my monitor?

I know that one can do quite much programatically (shell commands) to the attached monitor hardware in Linux: turn it on/off (truly, hardware-wise) with xset dpms force off toggle the brightness (...
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Unable to share entire screen

I have Ubuntu 20.04 and I tried DWM window manager with the XDM display manager for a weekend but I didn't have the time to adapted to my style because I started classes at the university again. I ...
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'Multiple Display settings' always 'pop up' in Ubuntu 20

I'm on Ubuntu 20 Focal, gnome 3.36.3. Often, when I open any of the "system settings" or other apps like "Gthumb", the "multiple display settings" pop up and I have to ...
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Dual screen option is not showing in Settings → Devices → Displays in Ubuntu 18.04.4

I am using ThinkPad L490. In my Settings → Devices → Displays, display mode or dual screen mode option is not showing. Please refer screenshot:
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Xfce4 desktop location is /home/usr instead of /home/usr/Dekstop

My xfce4 desktop has all the files from home, but i had a Desktop folder inside home. How can i change the desktop location to work in other folder?
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Running multiple monitors with different DPI

I look thoroughly and I saw that this kind of question was not solved before in the AskUbuntu community. My problem is pretty simple and am sure a lot of Ubuntu users have it: Simply explained, ...
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Failed to start lightdm (stuck on bootloop)

Currently I was using kde on ubuntu. But after trying to install cinnamon and lightdm, I can't start my OS. It is stucked on boot logo. And it's showing, "failed to start lightdm". I tried ...
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Boot lubuntu 20.04 into command and not gui

So I have been using debian, raspbian and ubuntu, and I'm used to 'systemctl disable/enable lightdm' and 'systemctl start/stop lightdm' when I setup a server so I only use the gui when necessary. I ...
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Why is my ubuntu display manager doing this?

I rebooted my ubuntu machine and this happened with my display manager - the options on the sidebar jumbled together. How can I fix this?
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What's the replacement for lightdm service in Lubuntu 20.04

I used to do sudo service lightdm restart under Lubuntu 18.04 LTS to solve blackscreen problems sometimes. Now that lightdm is gone in Lubuntu 20.04 LTS, what is the service equivalent to lightdm ...
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Wayland in Ubuntu 20.04 (IntelGPU)

I sadly do not have the choice of starting a Gnome with Wayland session when logging in (no gear icon showing). Using a Thinkpad with integrated Intel GPU, WaylandEnable option in /etc/gdm3/custom....
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EXPORT DISPLAY UBUNTU 18.04 gdm3

Wanted to export the display from an application to my local workstation. Simple right? Not overly complex. Well, until you go down rabbit hole of gdm3. After what I believed where correct ...
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296 views

“Settings” option not appearing. After upgrading Ubuntu 20.04 LTS from 18.04 LTS

I upgraded my Ubuntu version to 20.04, Focal Fossa, by using the Ubuntu "Software & Update" feature. After completing upgrading it looks fine. But when I need to change display settings, right-...
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Reinstall a display manager [duplicate]

I've just been installing DDE on ubuntu and I accidentally chose lightdm over gdm3. What do I do?
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949 views

Installed LXQT but my display manager is shown gdm3 and Desktop Environment as GNOME

I installed ubuntu 20.04 on Raspberry pi 4. Updated and upgraded. Then ran the command "$ sudo apt-get install lxqt". After reboot I was on login screen, I could login. And when I checked desktop ...
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Pop-up window not fully visible

I am unable to view full popup window while opening the security option in Acrobat preference section. Attached screenshot for reference. How can I fix this My screen resolution is 3840*2160
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18.04 only booted into terminal, so I reinstalled gdm3 and now everything is weird [duplicate]

Yeah.... Ubuntu 18.04, it was fully updated earlier today. So, heres how it went, everything was fine, I shut down my PC as normal, a couple hours later, I turned my PC back on and for some reason ...
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193 views

Alternative Display Manager for easy login

I use currently Ubuntu with 2 Display Managers: GRUB and i3. Currently, in order to change the manager I log out and have to press a very small icon in lightdm to switch between GRUB and i3. I wanted ...
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657 views

Always loopback into loginscreen: How do I fix it? (Ubuntu 18.04, gdm3)

Installed a fresh 18.04 on a Lenovo T440. After 2 days, Ubuntu presents me a loopback into login screen every time I try to login. ALT + STRG + F2 brings me into console, where I can proceed with ...
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Laptop external monitor

Hoping somebody can help I have a dell G5 5587 laptop running Hera, I have connected to external monitor via HDMI cable. when the laptops lid is closed I can work on the external. when the laptop ...
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2answers
266 views

Login screen takes a long time to open after suspend

After upgrading to Ubuntu 19.10, it takes about a minute for the login screen to appear after closing and reopening my laptop lid or activating suspend directly. I have tried changing display ...
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1answer
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Debug desktop environment run

I've installed a Pantheon desktop environment (the one from elementaryOS) over Ubuntu 18.04 and now I have an issue staring this DE from lightdm. Particularly when I'm choosing Pantheon DE from ...
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1answer
2k views

Power Off not working in Ubuntu 19.10

I just upgraded from 19.04 to 19.10. On the session manager login screen, the 'Power Off' and 'Restart' options seem to have no effect. When I'm logged in as a user, the 'Power Off' command works. ...
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1answer
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Ubuntu starts in terminal mode

I recently installed KDE plasma in Ubuntu but then uninstalled along with all its packages using code sudo apt autoremove. Now when I start Ubuntu, it opens in terminal mode instead of regular ...
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Blank display after waking up, using external monitor as primary on a HP laptop

I'm running No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 10 (buster) Release: 10 Codename: buster with XFCE. My computer specification is : 00:00.0 ...
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1answer
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Desktop unresponsive after Disco Dingo Upgrade

I am experiencing some weird and very annoying UI issues after the Disco Dingo upgrade. I have a NVIDIA Graphics Card. My issues include no feedback from mouse clicks (however I can still see cursor ...

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