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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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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1answer
55 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
40 views

How to detect the vga signals [closed]

I am currently working on Ubuntu 12.10. We have functionality as we have two cameras (say left and right cams) for recording the videos which creates two different streams as stream-1 and stream-2. ...
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37 views

Upgraded to 14.04; display no longer operable

It's a rack-mount server that was running 10.04LTS for the last four years quite happily. I decided it was time to upgrade. As usual, it didn't go smoothly. I finally have it booting into the upgraded ...
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1answer
84 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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6 views

Mouse hits activitys corder w/ [Nvidia GPU] running X:0.0 and X:0.1

How to fix? Gnome is my favorite, I dont want to change it. But trying to hit the back button is hell. It keeps jumping to the other screen and procing minimize/activities. I need the seperate X. I ...
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1k 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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42 views

Black blank screen after restarting, but after logout the screen resumes to the way it was

I have recently installed Ubuntu 14.04 then following some webpages from internet i tried o install a couple of softwares including - Gnome by sudo apt-get install gnome-shell ubuntu-gnome-desktop ...
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1answer
26 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
148 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 ...
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1answer
7k 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 ...
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1answer
94 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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26 views

No display with ubuntu 13.10 server after intsalling ubuntu-desktop

Very first when i bought the system installed xubuntu. it worked good along with everything but had to give up due to battery backup issues. Then i installed ubuntu 13.10 serve. On top of that i also ...
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1answer
48 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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12 views

Video driver failed to load [duplicate]

I am dual booting ubuntu 13.10 along side windows 7. It was initially working fine. Suddenly one day, when i switch into ubuntu, it started loading and the screen went off. I thought there might have ...
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1answer
55 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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104 views

Chrome OS-style Display Manager

This is what the login screen looks like on Chrome OS. Is there anyway to make the login screen look similar to this, or any display manager which I can customise to look like this?
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40 views

Screen display missing

I installed ubuntu 12.04 server. After installation I can only see a black screen just like a terminal in full screen. Its the same every time I restart.But I can't find a desktop(ubuntu screen with ...
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1answer
562 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
609 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??
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115 views

How to end X session?

Is there a generic way to orderly end X session regardless of display mangager or window manager? More specifically, I use different windows managers for different users, and after reboot one user ...
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0answers
73 views

Login screen on the wrong monitor

I have an external monitor plugged to my laptop. I mostly use my laptop screen and use the external as a secondary monitor, sometimes not even turning it on. When I start the computer, the login ...
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0answers
161 views

How to enable onboard keyboard in fullscreen mode (using firefox)?

I want to use the onboard keyboard to enter text into a form in a website I have open in firefox. Ideally I want to run firefox in fullscreen mode. In non-fullscreen mode onboard comes up no problem, ...
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31 views

How to setup xdm to use kerberos without pam?

I know I could do this via PAM. But I see krb5 support in xdm souce. And Xsecurity says so, too. Then my question is, how? I cannot find a step by step document on this.
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2answers
1k views

How to fix a second screen

This is not a generic question but rather a specific one for my system. I just freshly installed ubuntu 12.04 and did all the updates. One of the updates told me to install additional hardware (for ...
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0answers
414 views

Xubuntu 13.10 laptop display pop up from sleep?

Upgraded to Xubuntu 13.10 recently and noticed that when I put my Dell D620 laptop to sleep/hibernate (closed lid) the laptop display & configure settings & layout pop up appears? This doesn't ...
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1answer
1k views

Replace LightDM with MDM on Ubuntu 13.10

I'm trying to replace LighDM with MDM on Ubuntu 13.10, but there already is package in Ubuntu sources called mdm. It's not display manager, but "The Middleman System"... So the PPA install doesn't ...
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1answer
112 views

How does display manager know which WM/DE to run?

I switched to Arch for a while and got very used to booting to the terminal, logging in, and running "startx" to start my WM. I, of course, could change which WM or DE to run in the ~/.xinitrc file. ...
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1answer
165 views

Unable to view my login screen and terminal screen

I'm unable to view my login screen and terminal screen - they're fully blank. Using PuTTY tool remote terminal is working, because if I install Wine in my Ubuntu 12.04 after restarting my PC, I'm ...
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87 views

Gnome 3.8 Update Issues

I installed Gnome 3.8 about 3 weeks ago and it worked great! Just recently I updated and everything about the boot-up has been a little odd. Firstly, the boot screen wasn't the purple and orange ...
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1answer
59 views

How to retreive a window from a dead/disabled monitor

Note: I have already found the solution to my issue. I am posting this question in order to leave information for anyone who may face the same issue that I did. However, I need to wait 8 hours to do ...
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2answers
2k views

GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod

I am getting the following error GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface `org.gnome.SettingsDaemon.XRANDR_2' on object at path /org/gnome/SettingsDaemon/XRANDR ...
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504 views

Change lightdm display resolution on the console

I am booting from the Lubuntu live-desktop-CD but the resolution doesen't work on my PowerPC Mac G4. I can go to the Cconsole with Ctrl+Alt+F1 Is there a config file for lightdm that I could change ...
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1answer
208 views

Multi Monitor Fullscreen video problem [duplicate]

So I have a question, I am somewhat new to Ubuntu and my Current system has a Three monitor setup on it. It's all hooked up and works great, but I wanted to install the disc that came with the ...
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2answers
381 views

How does the Display Server - Display Manager - Window Manager structure exactly work?

I would Like to know what exactly each does and how they are layered/structured or interrelated to each other, their functions, their interdependence, their communication protocols and when and why ...
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1answer
163 views

Why doesn't tty7 show a prompt with no display manager?

When I drop to tty1-tty6 through Ctrl-Alt-F[1-6] it shows a prompt, for obvious reasons (it's supposed to). However, if I kill my display server, and thus X, through something like sudo service gdm ...
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1answer
505 views

How to fix Ubuntu 12.04 display artefacts/freezes after switching users?

Some time ago I noticed a strange behaviour on my computer running Ubuntu 12.04. Here's a detailed description of the problem: I log into my account, work for some time, and then somebody else wants ...
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1answer
3k views

Ubuntu 12.10: black screen after installing nvidia-current [duplicate]

COMPUTER: Macbook pro 7'1 (mid 2010) GRAPHIC CARD: NVIDIA 320M Today, after a fresh install of Ubuntu Quantal Quetzal, I installed the suggested nvidia drivers from terminal by running the following ...
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518 views

Ran a script in xubuntu and my display crashed. Can someone advise on how to reverse it?

I have a script I found a while back to speed up installing Minecraft... for my kid... Anyway, I recently changed to Xubuntu and figured the same script would be ok, not taking into consideration the ...
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2answers
2k views

Where does LXRandr save its display configurations?

It looks like LXRandr can save configurations. But where are they saved and in what form? (I was thinking about activating them by shortkey.)
3
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1answer
2k views

How to use Xfce4-display-settings terminal commands?

What I want is a terminal command that would activate internal display in case it is de-activated in Xfce. (Then, I could run this command by a script+shortkey and get a solution to this problem). The ...
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2answers
1k views

Make Xfce display manager use internal monitor after restart

By default, if I connect an external display under Xfce, it is not activated until I choose to in xfce4-display-settings or lxrandr. If set to use external display only and then restart with that ...
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1answer
169 views

Logging in the New Created User Ubuntu12.04 lts

I just created an account with name rashmi and set its password. Then I restarted my system. When I log in to rashmi another screen appears for less than a second and then vanish and again the login ...
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2answers
4k views

How to Remove KDE Login Screen?

I accidentally installed KDE on my Ubuntu 12.04 Machine the other day, to find I really don't have a liking for it. I runned a apt-get command to remove the kde-full package, but programs like ...
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1answer
603 views

Boot fails after “Checking battery state”

I am on Ubuntu 12.04. As I was working icons on the top bar started disappearing. I tried to switch between the various windows but Alt + Tab was not working. I tried using the mouse to switch between ...
2
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1answer
1k views

Problem with LightDM & KDM

I'm a Kubuntu 12.10 x86_64 user. I recently found an exquisite KDM theme on (name of KDE artwork site). However, as the default display manager in Kubuntu is LightDM, I installed KDM with: sudo ...
2
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1answer
346 views

Use Gnome, but Login With KDM

I'm trying to find a way to make the login screen a KDE session in Ubuntu 10.04 while maintaining a Gnome Session after logging in. The reason for this is to change the login screen I detest. Any help ...
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2answers
890 views

How do I make the login screens and boot splashes match when installing different desktops?

I wanted to try out different desktop environments so I installed XFCE, KDE, GNOME, etc on top of Unity in Ubuntu 12.04 After a while I decided that I didn't like those other DEs and would stick to ...
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1answer
8k views

Different display and window managers for Ubuntu and how to install them

On surfing articles on Ubuntu, I came across posts for installing different desktop environments in Ubuntu. That got me thinking about different display & window managers they use and I made a ...
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4answers
2k views

How to take screenshot of an X11 based GUI from a text terminal (such as tty1)?

I tried using DISPLAY=:0 import -window root "$HOME/Pictures/screenshot.png" (import is part of the ImageMagick suite), but that just displays a black screen. I want to do this as I wanted to ...