The display manager (DM) is the program responsible for showing the graphical login screen in Ubuntu. As of 11.10, the default display manager is LightDM; previously, Gnome's desktop manager (GDM) was used.

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Ubuntu 16.04 (64bit, Unity 7.4.0) stucks in splash screen after enabled gdm3

I am trying to set gdm display manager on fresh install of Ubuntu 16.04 with unity 7.4.0 Installed and enabled gdm: sudo apt-get install gdm sudo dpkg-reconfigure gdm After reboot PC stucks in ...
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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
56 views

Start GUI-Application in Docker Container with sudo

System: Ubuntu 16.04 Display-Manager: lightdm I'm trying to create a docker container FROM ubuntu:latest where a GUI-Application is running in. The application needs to get executed with sudo to ...
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1answer
50 views

Restarting X session shows screen blank for some time and comes up

When I restart the X session using Ctrl + Alt + Backspace in Ubuntu Machine , the X session is restarted and blank screen is showing up for some period of time(3 sec) and then the session comes up. ...
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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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56 views

Removing user names from welcome screen

I used to have an LXDM in which there was an option not to 'select' a user to login to, but you had to type the desired username, and only then you can type in the password. I like it better than the ...
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22 views

ERROR in Installation of CUDA on Ubuntu 14.04 LTS

I am using ubuntu 14.04 and I tried to install cuda on it,but after installation gets complete ubuntu goes into the low graphics mode. I have tried it two times.What should I do?
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47 views

Display managers, aliases and dot-files

I am trying to set my system up to use the notion (ion3 fork) window manager, I logging in through the mdm display manager. Notion provides a a textual launcher that is activated by the F3 key. The ...
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50 views

What is the difference between display managers?

What is the difference between display managers,If I choose GDM over LightDM and switch display manager as sudo dpkg-reconfigure gdm and choose GDM with unity and not with GNOME or chooses LightDM ...
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107 views

15.10 Unity stuck after login, even as guest, background image permission denied despite 644

Yesterday I ran the last Ubuntu security updates, and now my desktop does not open anymore. Only the purple login wallpaper is visible (my user wallpaper is different and does not appear) and I can ...
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13 views

dependencies problems [duplicate]

I am running a kubuntu 15.10 machine. I tried to change my DM with a blank screen as result. After installing lightdm I got it. I could recover the /etc/X11/default-display-manager and I am back at ...
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37 views

change display manager

I' ve tried to change DM from ssdm to lightdm: Install lightdm (when installing I was asked to choose dm, choose lightdm) Backup /etc/X11/default-display-manager and made changes to it After ...
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2answers
675 views

gpu-manager overwrites xorg.conf

I have recently installed the NVIDIA drivers on my Xubuntu 15.10 machine but I had to remove them due to improper multi-monitor setup. Everything went fine, except for the fact that gpu-manager seems ...
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14 views

How to change the screen brightness from terminal? [duplicate]

My Ubuntu starts with full brightness. I want to know how to adjust the brightness of the screen from command prompt so that i can run it at startup.
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1answer
40 views

Wiley 15.10: Some windows are not visible

Right after installing Wiley 15.10 from iso image, I discovered that some windows are not showing up: The terminal, when you press CTRL+ALT+T The Chrome Browser which has been the 1st I've installed ...
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0answers
15 views

Is there a black and white alternative to redshift?

I have been using redshift for some time now, and I was wondering if there is a tool which, instead of dimming the colors, makes the display black and white. It can't be that difficult, considering ...
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2answers
110 views

mdmsetup returns exit status 1

I'd like to install and use mdm over lightdm with Cinnamon. I've installed mdm, but gksudo mdmsetup just opens a dialogue requesting authentication, then immediately exits with code 1. There's ...
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66 views

Display not recognised after switching off and back on

Sometimes, when I am away from my computer for a while, I like to switch off my monitor, because I feel it does not need to be active and waste energy for nothing. I have usually done this without a ...
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1answer
41 views

display menu doesn't show all options

I'm using two displays and for some reason I don't have the entire display menu. Is there some way to restore this (or change the usual settings with dconf editor or terminal)? I'm using ubuntu gnome ...
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0answers
25 views

How to execute command(s) before the Ubuntu display manager loads?

I want to execute a set of commands before the Ubuntu display manager loads up. The commands are xrandr configurations - would I need to use a script, since I'm using more than one command?
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191 views

How to start gnome/unity by SLiM?

I have an Ubuntu 15.04 and installed Unity, Gnome3 and Awesome WM. All worked fine: I could start any Desktop Environment by any Display Manager Recently I installed a SLiM DM. $ sudo apt-get ...
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1answer
318 views

How do I restore sddm after corrupted update?

A week ago I had a power failure in the middle of an upgrade. System now has um ... "issues." Below are the configuration, status, symptoms, etc. Please help however you can. System: kubuntu 15....
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18 views

Ubuntu live CD/Install only shows secondary monitor

I just tried to install the latest Ubuntu on a barebones machine. The machine only had a DVI port but also has a label that there is a VGA, but there is no port coming out of it. So it must have a VGA ...
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1answer
578 views

sudo nautilus results in “cannot open display” error

$ gksudo nautilus Failed to connect to Mir: Failed to connect to server socket: No such file or directory Unable to init server: Could not connect: Connection refused (nautilus:6072): Gtk-WARNING **: ...
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1answer
410 views

How to configure ubuntu 14.04 to run Icewm as default desktop display Manager

How to configure ubuntu 14.04 to run Icewm as default desktop display Manager. which files to Configure to do this
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Default display manager for Lubuntu

I have recently switched over to the lubuntu-desktop from the unity-desktop, using the following command: sudo apt-get install lubuntu-desktop The requisite packages are installed automatically. ...
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2answers
744 views

What is the difference between GDM and Gnome-desktop?

As GDM is GNOME Display Manager but it installs the GNOME desktop also when I replaces it with LightDM So what is the difference between installing GDM or installing Gnome-desktop environment?
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2answers
243 views

Minimal Display Manager sought

After getting a 3G modem for my laptop, I've started using Network Manager to manage my connections, and I quite like it. However, it is slightly annoying to have to be root to make any changes, ...
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1answer
191 views

Stuck on splash screen, does not progress to login manager

My login manager stopped loading, for no apparent reason, instead tty7 was a black screen I could type into but with no effect. I tried several variations of service lightdm restart service sddm ...
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1answer
405 views

How to change display's position from command line?

How can I use the command prompt to do get the setup shown below? Edit: I need the secondary display to be located to the left and half-way to the top of the primary display, as shown above. The ...
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144 views

Unable to login from User account or Guest account (not a duplicate question)

I have Dell 3521 laptop without dedicated video card. It came with Ubuntu 12.04 installed. One fine day, it prompted me for an upgrade, which i went for. During upgrade, its battery finished and once ...
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43 views

Unable to log in to any user account and with different Display Managers

All attempts to log in to my user account, guest, or an account I created to test get instantly thrown back to the login screen. I can log in through tty1 etc. I have tried deleting .Xauthority and ...
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87 views

15.04 Could not set configuration for CRTC63. Booting lid closed

When I boot my Dell Latitude E7440 laptop, an error dialog is show on login screen: Could not set configuration for CRTC63. If the lid is closed during boot, the disk crypto login is shown on ...
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3answers
1k views

Difference between alt+tab and alt+escape

On my GNOME + Ubuntu system, both alt+tab and alt+escape switch between windows. What exactly is the difference, if any, between them?
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1answer
668 views

Ubuntu : Why little yellow tint on display?

Why little bit yellow tint on Ubuntu OS? When I see white colors on both the windows and Ubuntu. Ubuntu is little yellow display. Why Its little tuned by Yellow color? Sorry I don't know weather its ...
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1answer
412 views

After switching from gdm to lightdm my screen turns off when I come to the login

I tried to change my Display Manager from gdm to lightdm. After a system restart everything was normal until I got to the login place. Instead of seeing the login screen I only heard the sound of the ...
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53 views

Ubuntu wont load after installing SLiM

A few moments ago I decided to give the SLiM display manager a go, and I installed it with apt, then I restarted my PC and it got stuck at the loading page with the ubuntu logo and the six loading ...
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2k views

/etc/X11/Xsession & LightDM

I'm running Lubuntu 14.10. It seems that LighDM invokes /etc/X11/Xsession only if directed to so by the user. In fact there is no shadow of it in lightdm-session wrapper. startx command line (...
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573 views

Setting no proxy, proxy and Authenticating network from terminal [duplicate]

Somehow I can not access my desktop and have access to command-line. I can ONLY see wallpaper after login (no icons), I think I messed up with lightdm. Other posts suggests that I can reconfigure it ...
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1answer
309 views

Stuck at splash screen of ubuntu when changing from Lightdm to GDM

After changing the display manager from lightdm to GDM, when I boot Ubuntu it gets stuck at the splash screen. What could be the reason and how can I fix this?
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29 views

Restarting window manager blackout

I wanted to restart the window manager so I issued sudo service lightdm restart but then the screen went black, the case speaker beeped once and that's it. I pressed the power button (once) the ...
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2answers
1k views

Some aplications run, but have no visible application window

I have a strange problem with the visibility of application windows (Unity / 14.04). Sometimes an application seems to be running, but without a visible window. When I click on their launcher icon, ...
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1answer
196 views

How to lower refresh rate on external display (projector) from 75 hz to 60 hz

I have a projector that is 3D Ready, but it can only handle a refresh rate of 60 Hz to use the 3D settings, yet for some reason it defaults to 75 Hz when I plug it in through the HDMI port (the only ...
0
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1answer
135 views

change desktop environment

How I can change my desktop environment after logoff, I cannot choose more than 10 desktop environments? Numbers bigger than 10 are not displayed. Old problem. I tried other display-managers but it ...
3
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1answer
566 views

List all available display managers

How can I get the list of all the display managers installed in my Ubuntu laptop from the terminal?
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2answers
343 views

Do logins by the gdm (or lightdm) user in auth.log mean my system is breached?

Please look at this auth.log (from Ubuntu 14.04) I have provided and tell me who this gdm user is and why there are all these unauthenticated logins? I am freaked out; please help! Here's the /var/...
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2answers
2k views

Please explain the parameters 'noexpose' and 'cycle' in xset

I have been trying for a long time to prevent my screen from blanking every 20 minutes. I understand there are many interlocking layers of applications that can do this and it is not straightforward ...
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1answer
277 views

Is there any hope of choosing peacefully between Unity and KDE at login time (or session restart time)?

I am almost new to Ubuntu 14.04 (64 bits, in my case) so I only know the Unity interface and a bit of Gnome from previous Ubuntu experience. As the new version of KDE looked promising, I installed kde-...
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3k views

Could not open X display, XDG_Runtime_DIR Error:

Output from terminal from where i tried to run nautilus and read an external drive. Also, i got a terminal window before logging in that system is running under log graphics mode, i will have to login ...
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1answer
101 views

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 ...