Questions tagged [gdm]

GNOME Display Manager (GDM) is a program which provides Ubuntu GNOME's graphical login screen.

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Gnome Shell running, with no one logged into it?

Ubuntu 18.04, logged out of GUI, accessed system via webmin and see an awful lot of memory being consumed by Gnome. Shouldn't this end when all users are logged out of the GUI? Can I kill all this ...
3 votes
2 answers
2k views

Ubuntu 18 login loop + startx works

So recently I got stuck in a login loop on Ubuntu 18. I tried some solutions posted here but none of them works for me so far. Here's what I tried by accessing terminal from login screen: Checking ...
0 votes
0 answers
171 views

Login screen remains grey after successful login

I'm using Gnome vanilla. Many times, after I login, instead of getting the normal Gnome shell desktop I get a grey screen. It's like the GDM greeter but without any controls whatsoever. When this ...
1 vote
1 answer
1k views

TTY startx runs different GUI than graphical.target

I recently setup a live Ubuntu 20.04 stick. This is the first time I'm trying Ubuntu, but I am somewhat familiar with the system because I have a RaspberryPi running Raspbian. Everything works great. ...
2 votes
1 answer
2k views

Can't logon to xfce4

I'm using Ubuntu 18.04 bionic and installed the xfce4 package. However, when I choose "Xfce session" in the login manager, it does not log me on to Xfce4 but instead throws me right back to ...
0 votes
0 answers
30 views

Got an unexpected dock

I installed lightdm on my ubuntu 20.04 , and then I switched back to gdm3. user login page is changed But the desktop environment is not changed yet , and I am facing many problems in it. I am totally ...
0 votes
0 answers
875 views

Can not access tty terminal

My HP Probook has problems with Display manager. Basically, for now I can not access even login page (While I am on login page, I can access tty isn't it ? But it is unreachable for now). I do not ...
1 vote
1 answer
501 views

lockscreen not available Ubuntu 20.04.2

My look screen is not working or even "not presented". After reboot I can unlock the device but after that I cant lock it anymore Super + L not working gnome-screensaver-command -l not ...
0 votes
1 answer
409 views

Device won't go to login screen after removing gdm3

My Lenovo Legion laptop has Ubuntu 20.04 on it. My initial problem was that, when I boot up the laptop after it goes to sleep, the screen will remain black and I have to reboot to log in again. I saw ...
2 votes
0 answers
428 views

GDM 3 - How to deactivate session choice?

When I enter my password in GDM 3, I can choose the session I want (Gnome, KDE, and whatever is installed). I have set a default session and I would like my users not to be able to use another one ...
1 vote
1 answer
632 views

Trying to install GNOME on Ubuntu on remote server

Im a fairy new user at Linux. I have Ubuntu 18.04 on a host at paperspace. I'm following this guide: https://www.teknotut.com/en/install-vnc-server-with-gnome-display-on-ubuntu-18-04/ Beside that I ...
5 votes
2 answers
17k views

(closed) Configuring and using Xdmcp with gdm3 on ubuntu 18.04

On a fresh minimal ubuntu 18.04 installation, I tried to activate and use the gdm3 xdmcp server. Here are steps I followed: Installation I used the normal installation. "Download updates during ...
8 votes
6 answers
45k views

Enable/Disable Passwordless Login/Autologin Via GUI/Command Line

Before I ask the question, would someone please help stipulate the Ubuntu definition for these two seemingly identical but different terms (I've given drafts.): Autologin - When you power up the ...
1 vote
0 answers
162 views

Plymouth glitch when I power off PC

So, I use 21.04 and when I power off PC then I can see that keyboard is off, but Plymouth is frozen, then in about 15 seconds PC gets off as well. I looked at logs and find 2 errors, is there any way ...
2 votes
0 answers
4k views

gdm3 doesn't start during boot ("session never registered")

I have Linux syg-5 5.4.0-73-generic #82-Ubuntu SMP Wed Apr 14 17:39:42 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux with Ubuntu 20.04 and Gnome. When I logged out today, my machine crashed for some reason,...
0 votes
1 answer
155 views

Ubuntu server 18 problem with display manager - can't see GDM properly

Lenovo sr650 server with 2 graphical adapters : Matrox Electronics Systems Ltd. MGA G200e NVIDIA Corporation GV100GL [Tesla V100 PCIe 32GB] After installing GDM - can't see it properly . Please ...
1 vote
0 answers
394 views

How do I enable mirror (clone) display mode on login screen? (gdm3)

My monitor is often turned off when I log in (I use the TV instead). I usually use screen mirroring (cloning) when logged in. But on the login screen, the mirroring doesn't work. Thus in my TV, I don'...
2 votes
0 answers
659 views

GDM3 Crashes system when external monitor connected with Wayland

I installed Ubuntu 21.04 today and would like to use it with my external monitor. However, I have discovered that connecting the monitor before startup made the system hang at the purple login screen. ...
1 vote
0 answers
374 views

boot stuck at /dev/sda clean XXX/XXX files, XXX/XXX blocks [20.04]

Been running 20.04 nicely for ~6 months. Laptop was sluggish today so did a reboot and now stuck at the titular screen. /dev/sda7: clean, nnnnn/nnnnn files, nnnn/nnnnnblocks Similar questions here ...
0 votes
0 answers
203 views

What versions of GDM are used in Ubuntu 20.04 and 20.10?

What versions of GDM are used in Ubuntu 20.04 and 20.10? I found the version history of GDM: https://help.gnome.org/admin/gdm/ I need this to submit a bug on GDM's bugtracker
1 vote
1 answer
2k views

Issues with Lightdm and gdm3 on ubuntu 20.04

I have been using ubuntu 20.04 since release, I started with gdm3 and then I got the infamous login loop error which I couldn't solve without switching to Lightdm. The issue is when I switch to ...
9 votes
3 answers
15k views

How do I change gdm3 login screen resolution?

The login screen was fine on first boot with Nouveau but when I installed nvidia-381 from the graphics-drivers ppa and rebooted my login resolution is extremely high making the font and ui really ...
0 votes
1 answer
1k views

GDM screen icon theme?

Does anyone know which file configures the default icon theme (indicator and status icons) used in the top bar of the GDM screen on Ubuntu 20.04? I looked inside the /usr/share/gnome-shell/theme/Yaru/...
0 votes
0 answers
90 views

Troubleshooting Ubuntu 20.10 freezing except for the mouse

I know there are a lot of questions online asking about this topic but most of them look for quick fixes and while they do usually work I am looking for a deeper fix that would prevent this problem ...
0 votes
0 answers
539 views

Customizing theme - where is the purple background set?

I've customized my GDM theme and Gnome Shell theme in Ubuntu 20.04 (using Yaru as the base). To do this I have modified both /usr/share/gnome-shell/gnome-shell-theme.gresource and the files in /usr/...
0 votes
0 answers
629 views

How to customise GDM?

I found this article, but there is no such setting in Ubuntu 20.04 am I right?
3 votes
0 answers
40 views

How to change the time to change to a black screen during the login prompt

Is there a way to change the timeout to change to a black screen during the login prompt? As it is, whenever I open up the laptop and resume from suspend, after pressing a key, the login screen ...
11 votes
3 answers
9k views

Remove blur effect on lock-screen

I have a slideshow running on my desktop (which is stored in ~/.local/share/shotwell/wallpaper/wallpaper.xml) and which also is shown in the lock screen. Since 20.04, there is a blur effect on the ...
0 votes
1 answer
2k views

Fast bootup, but slow login from GDM prompt to desktop

Specs Ubuntu version: 20.10 (groovy) Storage: SATA SSD RAM: 8 GB DDR3 CPU: AMD A8-4500M APU GPU: AMD Radeon HD 7640G Problem Bootup is quite fast at 14 seconds as reported by systemd-analyze. But ...
0 votes
4 answers
2k views

how to get out from admin/text mode

I have literaly no idea on what happened and what are the next steps. I've installed the upgrade to 18.04.1 LTS after restarting computer I found myself in admin (?)/text (? - I even don't know the ...
2 votes
2 answers
3k views

Problem with lock screen after suspend

I'm running Ubuntu 18.10, and I've changed my login screen to lightdm (since I don't like the gdm3 screen), but whenever my laptop suspends, it'll still show the gnome lock screen to log back in. ...
1 vote
1 answer
3k views

How to install gdm3setup?

I found this one thing called gdm3setup and it seems like its what I want but I have no idea how to install it. I went on the github website for the project and for Ubuntu it has a set of .deb files ...
0 votes
1 answer
3k views

Black screen with blinking cursor when booting!

I installed ubuntu 20.04.2 LTS. After installing, I restarted and everything was working fine. Today when I tried to boot up ubuntu again, I was met with a black screen and a blinking cursor. running ...
1 vote
0 answers
178 views

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 ...
0 votes
1 answer
648 views

Gnome login screen only displays on LED TV

I have an issue were when I boot up or logout the default gnome login screen will only display on my LED TV (which is normally off) connected to my graphics card. How do i ensure that the login screen ...
1 vote
0 answers
128 views

Ubuntu 20.04 LTS - Why am I only in one group?

I am experiencing the same problem as noted at: Why my linux account only belongs to one group? I am running 20.04 and GDM. I've also: Followed every suggestion I could find related to disabling ...
0 votes
0 answers
175 views

Computer does not complete boot cycle

Version is Linux dad 5.8.0-44-generic #50~20.04.1-Ubuntu SMP Wed Feb 10 21:07:30 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux I've got a newer system76 which will complete grub and the initial boot menus, ...
1 vote
0 answers
241 views

Machine starts to blank screen with blinking underscore every time, even after restarting gdm3

I have a Dell Precision 7540 with Ubuntu 20.04. I came into a problem where my machine would boot and get to a screen with a blinking underscore. This occurred after I closed my laptop, it had a blank ...
0 votes
0 answers
144 views

Login Screen: Disable the password visibility toggling button

I have a default 20.04 Ubuntu install and the login screen has a password-visibility toggling button (an eye). I wish to disable this button and make the password always invisible. How can I do this? ...
5 votes
1 answer
3k views

Stop pulseaudio from restarting under gdm/systemd! Other answers do not work!

When I boot (Ubuntu 18.04), systemd is starting up pulseaudio under user gdm. I don't want that - I want to run pulseaudio as my user, because of problems with pulseaudio under gdm and mpd. So I am ...
1 vote
1 answer
724 views

Ubuntu 18.04 booting in console mode even after reinstalling drivers

So basically I just did one thing (or one mistake I would say): apt-removing python2 and python3 since I wanted to reinstall it for other reasons. During the process I think it may removed something ...
1 vote
0 answers
728 views

Display Managers gdm3, xdm not working after upgrade to 20.04; lightdm stuck in login loop, only LXDE working [duplicate]

I just upgraded to Ubuntu 20.04. But I'm now stuck with problems with display managers. GDM3 (preferred DM for me) and xdm are just stuck at a black screen (with a blinking cursor/underscore). Next ...
1 vote
0 answers
338 views

UBUNTU: clean, 958917/30883840 files, 22643659/123523840 blocks [duplicate]

I have an issue with Ubuntu 18.04. I was preparing a presentation and I had to force the shut down since the screen was blocked. When I rebooted this was the message (on black screen), no more. I have ...
1 vote
0 answers
592 views

ubuntu 20.04 missing /usr/sbin/gdm3 and /lib/systemd/system/gdm.service

This is a followup to my earlier posting on this site. I have two different Dell machines running 20.04. Both worked fine, and then, for no apparent reason, when I rebooted, I could not get to ...
4 votes
0 answers
2k views

System-wide x11vnc for GDM on 20.04

I'm trying to setup system-wide x11vnc so even if no users are logged in, I can remotely connect and start a Gnome session. I followed this tutorial on the Arch Linux wiki as it seemed to mirror ...
0 votes
1 answer
3k views

Black Screen after login (Ubuntu 20.04)

Problem: After typing in my credentials I am greeted by a black screen with a cursor. My desktop environment does not load. How can I resolve this issue and get my desktop environment to load? System: ...
3 votes
1 answer
2k views

Overcoming black text and blank screens between plymouth and gdm-login boot stages

In Ubuntu 18.04.2, I would like to show a consistent background image from the start of Grub2 to the appearance of the GDM login screen. I have customized the ubuntu-logo plymouth theme to show the ...
2 votes
0 answers
2k views

Run two gnome sessions simultaneously on a single desktop, isolating one from another

This is to expand on Is it possible to have different desktop sessions each with different settings? First off I know how to run two desktops by running something like xinit /usr/bin/xfce4-session -- :...
2 votes
1 answer
2k views

Failed to start Light Display Manager on boot for Ubuntu 20

tl;dr; Light Service DM is not starting. I have tried fixing it via GDM3, was unable to do so due to broken packages. I think that somehow NVIDIA is involved, but I am not sure. Where to start from ...
1 vote
0 answers
97 views

Screen lock disables color correction profile

I calibrated my monitor using a colorimeter and the color tab in Gnome settings. The color on the screen looks good until the screen turns off (automatically after some time). When the screen starts ...

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