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 14.10 display issue

I have version 14.10 for desktop. The icons and also all the tabs that can be found at the top Are out of the screen. i go to display settings and tries to scale the desktop. I use a Geforce GT430.
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/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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56 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
46 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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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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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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42 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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133 views

Ubuntu 14.04 can't login with GUI

Today I decided to update my ubunt. Bad decision. I had Ubuntu 12.04 LTS installed and I updated it to the newest 14.04. After the installation process was done, I rebooted and tried to login at the ...
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1answer
73 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
67 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
68 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
113 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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42 views

Xubuntu Resume from Suspend issues Display Manager

First time giving Xfce desktop environment a try and loving it. I have it on an HP-Mini 110 1125nr, with Atom 1.6Ghz processor 2Gb RAM and 120Gb SSD. This machine has never been so smooth!! However, ...
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235 views

Authentication issues when booted into 14.10 - generally terminal works OK

Intel core i7 running 14.10 (upgraded) 64bit with i386 adaptors. No dual boot - only Utopic I have authentication issues across a range of programs and services when using Unity. As far as I can see, ...
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Windows still open but can't find display, unless i select them using alt+tab and F11

My windows displays seem to be missing. Even after selecting my display the from side panel and then using alt-tab, my display was not on the screen. To troubleshoot this i selected the terminal using ...
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39 views

Tiny text in Nautilus and Thunderbird

Tiny text in Nautilus and Thunderbird*. Ubuntu 14.10 (but was the same in 14.04 before the upgrade). System Settings: Screen Display: Scale for menu and title bars: I can make text smaller still (!!) ...
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2answers
150 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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1answer
481 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
71 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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247 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
172 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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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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2k 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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126 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
42 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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341 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
17k 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
702 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
178 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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34 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
76 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
59 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
2k 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
2k 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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289 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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285 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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2answers
2k 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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438 views

Xubuntu 13.10 laptop display pop up from sleep? [closed]

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
134 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
208 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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1answer
67 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
3k 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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1answer
277 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
492 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 ...
4
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1answer
177 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
549 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
4k 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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670 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
3k 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.)