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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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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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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160 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
47 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
28 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
58 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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30 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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21 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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35 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
36 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
110 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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51 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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27 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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313 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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120 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
106 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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17 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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21 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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71 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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331 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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2answers
160 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
105 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
89 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
174 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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59 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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296 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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17 views

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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44 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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183 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
682 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
76 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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285 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
195 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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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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1answer
49 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
403 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
20k 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
851 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
205 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
85 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
62 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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0answers
370 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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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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0answers
443 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
139 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
223 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
69 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 ...