In versions of ubuntu above 16.04 the default display manager is gdm3. I am attempting to remove the guest user from an ubuntu VM but I don't know how to do it without lightdm. How do I do this? I have tried switching to lightdm but I cannot find the lighdm.conf file, only the lightdm.conf.d file, and it is completely blank. I would really appreciate some help.
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After I saw , I realized that there are many guest accounts on my system:  grep guest /etc/passwd guest-jzXeRx:x:117:127:Guest,,,:/tmp/guest-jzXeRx:/bin/false guest-l5dAPU:x:118:128:Guest,,,:/tmp/guest-l5dAPU:/bin/false guest-FdSAkw:x:119:129:Guest,,,:/tmp/guest-FdSAkw:/bin/false guest-eBU0cU:x:121:131:Guest,,,:/tmp/guest-eBU0cU:/bin/false   Moreover, in this moment there is nobody logged as guest, but if somebody will login as guest, a new guest account is created - why, since there are already other guest accounts? After the new guest will log out, his account will be deleted. But why the other guest accounts remain? For what use/purpose?  It doesn't mind me at all this guest account, but I want to know if it is okay to delete them manually.
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I used to modify /etc/lightdm/lightdm.conf, adding the line greeter-show-manual-login=true, in order to allow login for hidden users and root.  Now I've just installed the new Ubuntu 14.04 and the file lightdm.conf is no longer located in /etc/lightdm. It's in /etc/init and has been totally modified.  How can I force lightdm login screen to show a field to input a login name?
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The /etc/passwd is supposed to have a line for every user on the system. Amongst the common username and root there is a bunch of other users. Some examples:  timidity:x:114:127:TiMidity++ MIDI sequencer service:/etc/timidity:/bin/false liquidsoap:x:115:128::/usr/share/liquidsoap:/bin/false statd:x:116:65534::/var/lib/nfs:/bin/false gdm:x:117:131:Gnome Display Manager:/var/lib/gdm:/bin/false mysql:x:118:133:MySQL Server,,,:/nonexistent:/bin/false    What's the purpose with all these users? How can I login as mysql or gdm? What will the password be?
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This didn't start out as a problem with the login loop.  I was attempting a clean install of Ubuntu 16 and using the new feature that allows it to detect proprietary drivers for me.  I started off with   When I attempted to use the recommended Nvidia Drivers, it caused the laptop to become unstable and freeze.    I attempted the remedy from that post and it resulted in a login loop.  I have attempted   sudo mv ~/.config/dconf/user ~/.config/dconf/user.old   Tried   sudo mv ~/.Xauthority ~/.Xauthority.backup sudo service lightdm restart   I have tried locating and disabling secureboot, but there is no secureboot option in the bios.  This is an HP DV2000 series laptop.  Nothing is helping    Can someone help?  edit:  Guest session does the same loop.  /var/log/Xorg.0.log shows a lot of stuff, but I took a pic of what seems relevant   Thing is the driver I first tried that started this mess was 304 drivers and the 364 drivers were supposed to be the fix according to other posts.  More editing:  I purged the nvidia files and it came back to a blank desktop w/o the interfaces so I right clicked and restored a backup.. The sidebar came back and it was running gallium.  I restarted and its the blank purple screen again.  I am thinking of just reinstalling and not using nvidia drivers.  The software center is telling me I have a presario and i should use 304 drivers.  Its not a presario. =(  At least the software center provides a suggestion for the coprocessor driver which is nice.
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Recently I installed gnome-desktop in my Unity Ubuntu 16.04.Now I want to set my Unity desktop environment as default.   I installed Gnome by using these commands :  sudo apt-get install ubuntu-gnome-desktop   then chose gdm3 as default.  Now, I have searched on internet how to do so, one of them say this :  sudo /usr/lib/lightdm/lightdm-set-defaults -s ubuntu   But it throws error saying :     sudo: /usr/lib/lightdm/lightdm-set-defaults: command not found   I'm using ubuntu 16.04.
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I want user foo to auto-login using LightDM (which has been used by Ubuntu since version 11.10). How would I do that?
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How can I achieve the following:  type vdm in the terminal  and that will be replaced by wine Program Files/The VDM++ Toolbox Lite v8.3.1/bin  I also wanted vdm to work in any folder I am whatsoever.
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Note: This is an attempt to create a canonical question that covers all instances of &quot;low-graphics mode&quot; error that occurs to a user, including but not limited to installation of wrong drivers, incorrect or invalid lightdm greeters, low disk space, incorrect installation of graphics card like ATI and Nvidia, incorrect configuration of xorg.conf file while setting up multiple monitors among others. If you are experiencing the &quot;low-graphics mode&quot; error when trying to login but none of the following answers work for you, please do ask a new question and then update the answers of this canonical question as and when your new question gets answered.   When I try to boot into my computer, I am getting this error:  The system is running in low-graphics mode Your screen, graphics cards, and input device settings could not be detected correctly. You will need to configure these yourself.   How do I fix the failsafe X mode and login into my computer?  Answer index:
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I installed elementary OS and e17 on my Ubuntu 12.04 from ppas. After logout and login, right click on desktop is not working in gnome and unity but working in file manger.When I login into Pantheon session, I don't find an option to open Home folder and my login display manager theme is also changed.I want to get back to default Ubuntu login theme.Can i change the login theme with simple-lightdm manager. I dont want to mess up my system.Please hemp me how to fix these.
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/desktop/gnome/peripherals/keyboard/general/disable_indicator in gconf is set to yes Additionally I restarted, but it's still there. Maybe there is some setting buried in CCSM?  here is screenshot of what I'm talking about if it's not clear:  I want to remove it if possible
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I tried to install gnome-shell on Ubuntu 16.04 and when configuring I choose gdm as my default desktop but after I reboot I didn't see the login screen , only the black screen with Ubuntu  logo and the red dots, so I have reinstall Ubuntu again.  My question How can I install gnome-shell on Ubuntu 16.04?
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I need guest users to be in a specific user group. I probably could create a new guest-account and add it to the group. But I'd rather like to use the existing guest-session-option integrated in Ubuntu (16.04). Is there any way to do it? I only found ways to automaticaly launch scripts/programs or costumize the startup-dialog. Thank you very much in advance!
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My ubuntu boot screen shows up in a strange low resolution, almost text mode, instead the usual and sleek white "ubuntu" over dark background. It's not a big issue because when GDM loads everything becomes ok, but If there's an easy way to fix it I would like to give it a try.
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I've installed the  (beta) following the step in  for Ubuntu Quantal Quetzal. My system is 64 bit and my graphic card is an ATI RadeonHD 6670, this g.c. is Officially Supported (Catalyst &amp; Open Source), you can confirm that from this .  I don't have any problem, except the AMD testing use only watermark. I see the following frame in any stage into the OS (logged, unlloged, etc.) except in the terminals.     I found different versions of how to remove this image, but this change according to the system, so I want an answer from this popular (trusted) site.   How to solve this issue in Ubuntu 12.10 32b? This procedure is different in a 64b system?
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I am trying to change some gconf settings in Ubuntu 12.10. I would like to change the lightdm greeter background.  I have discovered that while logged in to unity as a user while running X server, I am able to do this with:  sudo xhost +SI:localuser:lightdm gsettings set com.canonical.unity-greeter background "'/usr/share/backgrounds/micros-background.png'"   The problem is that this requires me to login as a user under X. So that entire window manager needs to be running. But I want to use chroot to change these settings without any X server running. I just want to mount the partitions and change gsettings without having the full window manager running.  Is there a way to directly change gsettings without being logged into X and Unity?  Or alternatively... is there a way to bring up the X server and Unity in the background so that I can make the changes without having a full windowed display come up on my monitor?
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Somehow, while playing around with LightDM and Webkit Greeter, the ownership of the .Xauthority file in my home dir was given to the root user and I couldn't login because I hadn't the privilegues to lock the file.  I was able to regain ownership of the file and I could login again. (After several hours of reinstalling LightDM and it's greeters)  So now everything's working fine again. But I'd like to know how this happened. Is this a bug in LightDM or Webkit Greeter or something else?
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I just updated my laptop from Ubuntu 14.10 to Ubuntu 15.04.  Now on a restart it fails to make it to the login prompt.  The system looks to be in a cycle of failure and I see the message repeatedly  [ OK ] Started Light Display Manager. [ OK ] Started ACPI event daemon.        Starting ACPI event daemon...        Starting Network Manager Script Dispatcher Service.... [ OK ] Started Network Manager Script Dispatcher Service.   The contents of /var/log/Xorg.0.log show a segfault.  Sorry I can't copy the backtrace now, but the chain goes  /usr/bin/X /usr/bin/X /lib/x86_64-linux-gnu/libc.so.6 /lib/x86_64-linux-gnu/libc.so.6 /lib/x86_64-linux-gnu/libc.so.6 /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so /usr/bin/X /usr/bin/X /lib/x86_64-linux-gnu/libc.so.6 /usr/bin/X Segmentation fault at address 0x41   I'm on a Dell Precision m3800.  Since the nVidia driver is implicated in the stack trace, I'll start with swapping that out.  Any suggestions for my next steps to try to fix this?  thanks, Dennis