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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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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31 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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10 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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82 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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45 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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33 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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19 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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93 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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215 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 ...
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11 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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315 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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26 views

Icewm Window manager does not show images

In ubuntu 14.04 On running Java Application that contains GUI. The icewm window manager shows only the background frame with grey color it does not display any picture. Pictures are in PNG format
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254 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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504 views

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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41 views

Logging in to Ubuntu without a Display manager

So I want to login to my system without a display manager(lightDM). How would I go about doing this? or Could removing lightDM break the system? My current WM is i3. so i3 specific instructions would ...
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2answers
473 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
163 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
138 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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141 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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0answers
108 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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35 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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74 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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511 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
398 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
252 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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49 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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1k 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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327 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
219 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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24 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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23 views

What can I do with the login manager on the command line?

Init posesses an incorporated login manager, can I see its process on the command line or acquire further information about it just using the command line? Also, there is another login manager ...
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179 views

Display manager fails to start in ubuntu 14.04

I removed some packages from Ubuntu. But I faced a problem with the display manager. Errors: Starting recovery option iF display manager fails to start [fail] stopping boot sequence auditing ...
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2answers
616 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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167 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 ...
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1answer
116 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 ...
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1answer
398 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
273 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 ...
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2answers
1k 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
238 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 ...
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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 ...
2
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1answer
79 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 ...
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1answer
608 views

Why bash history is corrupted and how to recover it?

Today after upgrading to Ubuntu 14.04 (from 13.10), I pressed the key on my laptop (DELL Inspiron N4010) keyboard which is designed to decrease LCD backlight intensity. This key and its opposite ...
5
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1answer
24k views

Xubuntu 14.04: Screen Resolution 1440x900, no xorg.conf or lightdm.conf

So I'm quite confused now by the fact that I read a lot of different solutions for a Screen Resolution problem, but none of them apply to my case (I think). So I'm running a Xubuntu 14.04 x64 and ...
3
votes
1answer
1k views

Can't boot into unity/ubuntu after installing KDE

Here's the situation: I have a separate /home partition to make installs and upgrades easy. I just installed the latest version of Ubuntu 14.04. Everything was great. I installed the LXDE desktop (not ...
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1answer
268 views

Switch from GUI to the command line interface/console temporarily

I want to switch off the GUI, and only leave the command line interface or it is also know as the CLI. How would I do this?
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1answer
106 views

Screen Sharing a Single Application

I'm curious if there is a way to share a single application window with another machine without sharing my entire desktop? Perhaps there is some way to virtually create a new display and place my ...
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1answer
73 views

Unable to login through LightDM

After executing the following script (I removed all occurrences of tmp, mind you. Or at least I thought I did) and rebooting the system, I'm no longer able to log in through the display manager. ...
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1answer
3k views

Ubuntu is too big for my screen

I have just installed Ubuntu 13.4 on my desktop -- I am using a visio 32" tv as my monitor and have no problem with the screen size when windows is installed -- but with Ubuntu I can't see the icons ...
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1answer
4k views

How to reconfigure lightdm? [duplicate]

Last night I installed KDE. But then however my Desktop manager changed into KDM. How can I go back to my default Desktop manager lightdm??