LightDM (Lightweight Display Manager) is a Display Manager for the X.org X server.

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Why when I disable secure boot in Ubuntu 14.04 can I still not run NVIDIA-367 graphics driver?

Ok, so following the answer here I disabled secure boot module with: sudo apt install mokutil sudo mokutil --disable-validation I'm running Ubuntu 14.04 on an Asus M51AC machine. The BIOS version ...
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1answer
23 views

System Shutdown

After a recent update (not sure which/when) the login screen no longer has the cogwheel for shutdown. How do I restore it? I have three systems, only one (Toshiba laptop) has this issue.
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7 views

Why are my displays not working anymore?

I was working and managed to run out of memory with a Java VM which required me to reset my machine. From that moment on Ubuntu was broken. It was not possible to login for me until I re-installed ...
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15 views

Can't change keyboard layout on login screen

When the PC wakes from locked state and I try to change keyboard layout on a login screen, it flickers revealing the desktop but the layout isn't changed. Everything worked fine on 15.04. Any idea on ...
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55 views
+50

Can't get out of console mode. Screen dies after 10 minutes

A single-board computer (Lubuntu 15.10, kernel version 4.2.0-41-generic) kept freezing when running various applications, most importantly the automated data acquisition application we are developing, ...
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1answer
50 views

how to disable lightdm(display manager) on Ubuntu 16.0.4 LTS [duplicate]

How do I disable lightdm(display manager) during bootup of my machine? I want to bootup to command prompt and not into GUI desktop. I am using ubuntu 16.0.4LTS
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20 views

14.04-How to install Unity Greeter without installing ubuntu-desktop

so I've been using Ubuntu Desktop and I'm happy with it. But now I want to try out MATE desktop on 14.04, and I found this guide: http://www.omgubuntu.co.uk/2014/08/install-mate-desktop-ubuntu-14-04-...
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27 views

Missing “poweroff” in lightdm

I have the next problem. When I try to poweroff or logout, the lightdm show well but only de Universal Acces button show in the top bar. There is not the poweroff button, so I have to execute "...
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9 views

lightdm freezes frequently when working with windows

Ubuntu 14.04LTS keeps hanging if I close or minimize windows. When this happens pressing "Alt", Ctrl+Alt+Backspace or Ctrl+Alt+F1 and then Ctrl+Alt+F7 usually solves the problem: window which does not ...
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16 views

Dark Themed status bar

Status bar has got a dark theme(Screenshot attatched).I installed kubuntu desktop. Then I removed it along with all other files. Also, i restarted lightdm. Did'nt work out. Then I removed lightdm and ...
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72 views

Upgrade from 14.04 “Started Update UTMP about System Runlevel Changes”

I've a System76 laptop designed for Linux. I had it on Ubuntu 14.04, and wanted to upgrade to 16.04. I updated everything with apt-get upgrade then told it in the software updater tool to notify me ...
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9 views

lightdm cannot open second session

Using xubuntu 16.04, I am used to open 2 user session. Today it stopped working, and if I logout a user, I have to restart lighdm service to be able to login again. Any hint? I don't know which logs ...
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1answer
98 views

Restore Ubuntu 16.04 Login Screen

I installed Ubuntu Kylin Theme but I want to restore the original login in screen for ubuntu, I tried to uninstall the theme, purge and reinstall the lightdm and also change the default to gdm with ...
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0answers
27 views

ubuntu lockscreen issue

When I do Super + L in Ubuntu it locks the screen and original lock screen with white dots appears. Then after 30 seconds the screen goes black and when wake it up again lightdm greeter is shown ...
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1answer
43 views

LightDM GUI fails in Ubuntu 14.04

I have an Ubuntu 14.04 computer running . Yesterday, I was trying to install Teamviewer, but I was not able because apparently it depended "on libgcc1". After doing some search, a specialized forum ...
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10 views

lightgdm change password dialog for domain users

I did enable login to a freeIPA domain in lightdm by setting greeter-show-manual-login = True. Login is working except if a password is expired. The change password dialog is not shown in lightdm. ...
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13 views

How do I set the scaling of my lightdm to 1?

I am using a Surface Pro 3 with Ubuntu and I would like to apply the scaling of 1 to the lightdm login screen. This is an image of my display settings with the scaling at one. This setting allows my ...
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3answers
70 views

16.04 - lightdm - run command every login attempt and every account unlock

I need to make a picture with webcam at every login attempt. So i wrote a bash script, placed it in the /usr/local/bin/photo.sh But here is the question - I don't know how to run this script at every ...
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1answer
64 views

kubuntu 14.04 KDE login impossible after update

I have a major issue - a few hours ago I updated my kubunt 14.04 machine - I delayed this update a bit since I did not want to reboot my machine. Since KDE Startmenu did not appear anymore when I ...
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22 views

Ubuntu 15.10 Stuck on black screen with blinking cursor after boot animation

I did the normal ubuntu upgrades, added these lines to startup applications-commands: sudo aticonfig --px-igpu and sudo tlp start on last working boot. These could be one of the causes but I am not ...
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0answers
19 views

Where does Unity/Unity-Greeter Load X Configuration From?

On my setup, I have one monitor that has been rotated vertically, and another that is the usual horizontal orientation. I've set all the display settings in my GNOME shell so everything looks fine, ...
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0answers
22 views

“incorrect login” come at virtual console at the time of trying to fix “nothing appeared issue after login” at ubuntu 16.04

I am running Ubuntu 16.04 LTS in dual boot along with Windows 10. Everything worked fine. But, today after applying software update and reboot, when I type password at login screen and hit Enter, ...
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47 views

Blank Screen, no terminal, when ctrl+alt+f1, trying to install nvidia drivers

So I'm trying to update my graphics card drivers because right now I don't have any. To do this the installer says I need to quit x server. I know what I should do is do ctrl + alt + f1, then run ...
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12 views

Making lightdm default [duplicate]

I installed xdm on Ubuntu 12.04 LTS and made it default.Now I want to revert to lightdm.how could I do that?
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1answer
51 views

How to disable the shutdown, reboot and hibernate options in the lightdm loginscreen?

I'm currently building a kiosk system based on xubuntu 16.04 and have to lock it down, in order to do that I arrrived at the point where I want to disable the above mentioned option in the lightdm ...
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1answer
81 views

Set default Resolution system wide [duplicate]

I'm using Ubuntu 16.04. addicted@ADDICTED:~$ xrandr Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384 DVI-I-0 disconnected (normal left inverted right x axis y axis) DVI-I-1 ...
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1answer
42 views

I mistakenly purged gsettings-desktop-schemas; how can I recover?

Here's how things went from bad to worse: I wanted to remove an item (an icon) on the Unity-greeter top panel. (The greeter is the only Unity thing I use). So I made some changes in one of the Unity-...
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1answer
42 views

Access LightDM configuration in KDE system settings (Kubuntu 16.04)

I'm running Kubuntu 16.04 and use LightDM (not SDDM). In a previous version of Kubuntu it was possible to access the LightDM configuration (e.g. changing background,...) via the KDE system settings. ...
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1answer
62 views

Login with LightDM fails

I try to login with LightDM on Kubuntu 16.04. LightDM is the only installed display manager. I see the login screen and enter my password, but I get the message Failed to start session. The last ...
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1answer
171 views

startx doesn't work on ubuntu 16.04

I modified grub, so that whenever I boot, it starts in command line mode. However, when I type startx, it gives me a screen with the ubuntu background on it and my cursor is an x. I can open things ...
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37 views

How do I configure the lockscreen to use my PAM module in 16.04

In 14.04 I was able to do this by adding a line to /etc/pam.d/lightdm and my module is invoked for both login and the lock screen. In 16.04 it is only invoked at the login screen; the lock screen ...
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1answer
12 views

lightdm launches upstart with a proxy configuration. Why?

My computer seems stuck with a bad case of an hardcoded proxy. I have already tried setting no proxy in the Ubuntu configuration utility and applying the change system-wide. Grepping /etc for the ...
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32 views

login error in Ubuntu 16.04 with X authority problem

I've Installed Android Studio and wpscan metasploit and LAMP Stack server on my system. The next day when I've tried to login to my system I got that black loop page and backed to my login page. I'...
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48 views

Severe graphic artifacts on screen after screensaver!

Note: I tried to use descriptive language, but because I'm uncertain of the problem's underlying details, I'm not necessarily able to use the most accurate and descriptive language. Often, when I ...
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0answers
52 views

After fresh installation of XUbuntu 16.04, US layout on USB keyboard after each reboot

The built-in keyboard of my laptop is connected to the system as a USB device. During installation of XUbuntu 16.04 from the official 64 bit ISO image, I was asked about my keyboard layout. I ...
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69 views

Login screen asks for username after removing and reinstalling lightdm

I have uninstalled lightdm by sudo apt-get remove lightdm by mistake but I installed it again by going to virtual console and using sudo apt-get install lightdm but the problem now I am encountering ...
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How do you protect Ubuntu login?

I seem to remember that a few years back, in order to login on Windows you had to type Ctrl-Alt-Del to get a login screen. The advantage of this was that if you had a cat or child that liked to ...
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19 views

How to log in to an account which is hidden from the lightdm login screen? [duplicate]

I followed the accepted answer of How do I hide a particular user from the login screen? (the one about modifying /var/lib/AccountsService/users/USERNAME) to hide the user guest-config from my lightdm ...
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1answer
180 views

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

I can't find this information, and while trying to install the nvidia drivers for my laptop, I got a message explaining that I had 2 display managers installed, and that seemed strange.
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1answer
49 views

How do I change the LightDM unity-greeter wallpaper behavior?

Ubuntu 16.04 x86_64 This is not how to change the login screen wallpaper, or how to stop dynamic wallpaper switching. This is how to set the default behavior from "Scale" (or whatever the current ...
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23 views

How do I configure Ubuntu 14.04 LTS such that at the login screen, a brief power button press initiates a clean shutdown?

I have a system that runs an up-to-date Ubuntu 14.04 LTS, with Xfce as the window manager and the default login/session manager. (LightDM with the Unity greeter? It certainly looks very similar to ...
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2answers
69 views

login loop on ubuntu gnome 16.04

I'm stack in login loop on my first account. I can log in with a guest one and for a new one that I created on terminal. This is the log errors, please help me understand what is causing the sigterm.
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1answer
44 views

Can't get past LightDM

I don't know exactly what caused this, but I rebooted my Macbook Pro and when I tried to log back in to Ubuntu MATE, it took me back to the login screen. I have tried Fn + Ctrl + Alt on all of the ...
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1answer
336 views

How to set the screen resolution in Ubuntu 16.04 64 bit running under VMware workstation 12 player on a Windows 7 host?

I can set the screen resolution manually once I log in using the following command: xrandr -s 1360x768 but I am not able to make it "stick". Every time I log back in, the resolution for a little ...
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1answer
67 views

Ubuntu gives a purple screen while booting

I have ubuntu 14.04 with Windows 10. It gives the purple ubuntu screen on start up. If I go to the recovery mode and then resume from there, I go on to the login page where it gets into a login loop. ...
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1answer
71 views

Nvidia 361.42 and LightDM problem on xubuntu

I am using xubuntu 16.04 with intel and nvidia GPUs. When using intel there are no problems, when doing prime-select nvidia and logging out lightdm will not start with the error message (see below). ...
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1answer
29 views

Can't login due to kwallet error with nvidia drivers

I have a workstation with 2 nVidia Quadro K620 video cards and 3 monitors. In order to drive all 3 monitors I have to have the nVidia 361.45.11 drivers installed. After applying updates recently, I ...
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107 views

Ubuntu 14.04 login loop with lightdm and gdm black screen

I came to my computer a few days ago and found a login screen. Because I have bypassed the login screen in ubuntu settings, this was very strange. I tried logging in and found that I was in a login ...
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77 views

Lubuntu 16.04 doesn't automatically log in if monitor is not plugged in?

I want the machine to automatically log in so that it can start processes as the main user on boot. I have the settings set to auto login: /etc/lightdm/lightdm.conf [Seat:*] autologin-guest=false ...
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0answers
102 views

Dual monitor setup: one screen works, the other is a blank backlit screen

I have a dual monitor setup, on Ubuntu 15.10, with LightDM. Both monitors connected by HDMI, one connected to my NVidia GPU, and the other connected to my integrated graphics card. I recently ran into ...