Debian Multimedia :: Gdm3 / Gnome And Multiple X Sessions

Sep 11, 2015

Running Jessie (with a low-pinned Debian-based repositories added to my sources.list (e.g. Kali, kxstudio) for those packages not currently available on Debian (like the Kali menu of security tools). Running on a HP 15-r189nd (Energy Star) laptop.

First question: How do I get GDM3 to add root as an option during login? I can type the root user name in. I don't need it to show the root user in the user list (would actually prefer to need to type it in), but I do want to be able to start an X session as root, since some of the Kali tools (e.g. nmap) needs root to function fully. If I type in root and try to start, it just takes me back to the GDM3 login.

Second question: When I want to select my Desktop Enviroment/Window Manager in GDM3, the list appears below the little gear so I can only see half of the list (xfce not visible to select). How do I change the GDM3 appearance/settings that will change the position of the DE list?

Third question: How do I get multiple X sessions running simultaneously? What I have been able to do, while logged in as myuser and running X on tty7, is to log into a tty[1-6] as root, and then startx -- :1, but this somehow skips my default desktop manager (GDM3) and boot straight into LXDE (with no menus!). In /etc/X11/default-diplay-manager I have: /usr/sbin/gdm3 ? How do I get startx -- :1 to start a desktop manager?

Fourth question: When I did the above startx -- :1 as root, it would start the X session in the same tty (e.g. tty2) where I was logged in as root running the startx command. It used to be (in older Linux versions) that startx -- :1 would start an X session on tty8 (and the default would be :0 on tty7). Is this the (new) way things are supposed to work? Or is there something wrong with my setup?

Question 5: Once I have started an LXDE session as root, how do I get it to show the full application menu that my regular user can see? Can I just copy the config files over? Which ones? Or is there a better way?

Question 6: Gnome used to start fine. Then I ran Gnome on Wayland once, and now regular Gnome (on X?) no longer runs, but give me a "Oops! Something went wrong" error and Alt-F4 just takes me back to GDM3. Classic Gnome and Gnome on Wayland still runs OK. Should I log a bug report?

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Debian Multimedia :: Gdm3 Can't Start Gnome-session

May 7, 2015

I installed jessie from a beta/rc shortly before release on my MacBook Pro 13 Retina and have kept it up to-date with apt-get dist-upgrade. Rcently gdm3/gnome-session have stopped working together. When I log in the screen goes black for a couple of seconds then goes back to the login screen. This happens with "System Default", "GNOME Classic" and "GNOME", but not with "GNOME on Wayland". However, Wayland seems to have some other issues. I haven't tried an alternative dm yet, eg lightdm, but the GNOME desktop does work when started with startx.

I've just used journalctl to get logs of what gdm3 and gnome-session were doing at the time. After booting I waited until the clock reached the next minute (19:55) so I'd know at which point in the logs I'd hit enter on my password. I'll post the gdm log separately in two chunks because the forum server doesn't seem to like text attachments and they're too long for one post.

Log from gnome-session:
Code: Select all-- Logs begin at Thu 2015-05-07 19:54:06 CEST, end at Thu 2015-05-07 19:56:41 CEST. --
May 07 19:54:08 jeanette gnome-session[885]: gnome-session[885]: WARNING: Could not parse desktop file caribou-autostart.desktop or it references a not found TryExec binary


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Debian Multimedia :: Gnome-shell Does Not Start Logging In Via Gdm3 Greeter

Oct 8, 2015

Some days ago (2015-09-28) I installed Debian testing amd64. Log in as a user failed and instead of the Gnome UI there was a sad face with the text: „Oh no! Something has gone wrong. A problem occurred and the system can't recover.

All extensions have been disabled as a precaution. Log out“.

The relevant output of journalctl (run as root) said:

etc/gdm3/Xsession[5379]: cannot connect to brltty at :0
- /etc/gdm3/Xsession[5379]: Service 'org.kde.kaccessibleapp' does not exist.
- gnome-session[5379]: x-session-manager[5379]: WARNING: Application 'gnome-shell.desktop' killed by signal 5
- gnome-session[5379]: x-session-manager[5379]: WARNING: App 'gnome-shell.desktop' respawning too quickly
- x-session-manager[5379]: Unrecoverable failure in required component gnome-shell.desktop

[Code] ...

After some investigating, I found three work-arounds.

(1) Use gdm3-autologin: In /etc/gdm3/daemon.conf, remove the double crosses and insert own user name
AutomaticLoginEnable = true
AutomaticLogin = <own user name>
Disadvantage: Only one user can have access to the Gnome ui. If you log out, you enter the gdm3 greeter and … see above.

(2) Turn off gdm3 by running 'systemctl stop gdm3' as root, log in into a terminal as a user and run startx.

(3) Install package lightdm and make it to the standard display manager with 'dpkg-reconfigure lightdm'.
Disadvantage: Energy manager and screensaver settings of the Gnome control center are ignored.

The easiest way, however, especially if there are several users, is logging in via the gdm3 greeter.

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Debian Multimedia :: Using Startx For Multiple X Sessions

Sep 20, 2015

I have been able to log into a tty[1-6] as root or my user, and then startx -- :1, while logged in as myuser and running X on tty7, , but this somehow skips my default desktop manager (GDM3) and boot straight into LXDE (with no menus!). In /etc/X11/default-diplay-manager I have: /usr/sbin/gdm3 ? How do I get startx -- :1 to start a desktop manager?

Related 2nd question: When I did the above startx -- :1, it would start the X session in the same tty (e.g. tty2) where I was logged in when running the startx command. It used to be (in older Linux versions) that startx -- :1 would start an X session on tty8 (and the default would be :0 on tty7). Is this the (new) way things are supposed to work?

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Debian Multimedia :: Adding Window Manager To Sessions Menu Gnome

Mar 10, 2011

How would I add a window manager to the gnome sessions menu on debian squeeze please? The window manager has been compiled from sources.

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Debian :: Multiple Sessions With X Window

Jan 18, 2011

I have two Debian boxes, A and B. I would like that a window (for example vlc, or whatever) displays on both A and B. The process (i.e., the X11 client) runs on A. If I interact with the window from box A, it should affect the window on box B. And, if I interact with the window from box B, it should affect the window on box A.

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Debian :: Iceweasel - Secure Sessions On Multiple Profiles

May 18, 2010

I'm having problems establishing secure sessions with my bank's online banking service provider. I've already contacted their local tech and together we were unable to solve the problem. I've tried deleting my cookies, session store, cache, and none of it worked. He's currently forwarding our conversation to the service provider's tech support line, but who knows what will come of it. Or even if they will offer support for an iceweasel user. I'm using Iceweasel 3.6.4~build2-1 out of the experimental repo.

I'm able to login successfully to online banking site to view my list of accounts, however if I try going any further than that, I'm redirected to an error message page that tells me a security error has occurred - the online session has expired. I get this on browser profiles 1, 2, and 3, however I do not get the error message on profile '0' (default) or on newly created profiles. And as mentioned earlier, I've tried deleting all persistent data (cookies, session, cache) on a non-working profile and the problem still exists. Let me know if I can provide any more information.

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Debian Multimedia :: How To Log Into X Session As Root Using GDM3

Sep 20, 2015

To use most of my Kali applications, I want to be able to log into an X session as root. I know it is generally a bad idea and I don't want to do it as a rule, but it is useful for penetration testing (e.g. nmap and its GUI don't have most of the useful options when run as a regular user).

So how do I get GDM3 to allow me to log in as root? Currently, if I type in the user name "root" and log in, it just takes me back to GDM3. Could it work to add root to my user group (I really don't want to add all kinds of security holes)?

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Debian :: Gnome-sessions Option Not Available At Logon?

Jan 30, 2011

I have been running Lenny with the non-free nVidia drivers for a while now, but decided to run testing RC2.When I was done my monitor had a solid blue-gray background and the mouse pointer, but none of the GUI parts displayed (blank). After a couple of checks I went back to the gdm logon screen and opened 'sessions' to _not_ find Gnome as one of the choices. So I logged into Gnome(failsafe) and got my full GUI.Console (F1) and xterm also work fine.Trying to get my Gnome Desktop back. GDM is working and I have the session choice for TWM, but with Gnome(failsafe) working I haven't tried it yet to see if it works.

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Debian Multimedia :: Unable To Disable Gdm3 In Jessie

Dec 31, 2014

I have a fresh install of Jessie and I am unable to disable gdm3. I issued:

Code: Select alluser@debian:~$ sudo systemctl disable gdm3.service
Synchronizing state for gdm3.service with sysvinit using update-rc.d...
Executing /usr/sbin/update-rc.d gdm3 defaults
insserv: warning: current start runlevel(s) (empty) of script `gdm3' overrides LSB defaults (2 3 4 5).
insserv: warning: current stop runlevel(s) (0 1 2 3 4 5 6) of script `gdm3' overrides LSB defaults (0 1 6).
Executing /usr/sbin/update-rc.d gdm3 disable
insserv: warning: current start runlevel(s) (empty) of script `gdm3' overrides LSB defaults (2 3 4 5).
insserv: warning: current stop runlevel(s) (0 1 2 3 4 5 6) of script `gdm3' overrides LSB defaults (0 1 6).

Restart and still displays the Gnome 3 login manager.

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Debian Multimedia :: GDM3 Login Screen Orientation

May 23, 2015

I want to set up the GDM login screen in vertical orientation = left = (xrandr -o 1) due to my monitor.

I used Ubuntu and the below method has been working until I switched to Debian8 now.

[URL] ....

Rotate login screen

If you have your monitors setup as you like (orientation, primary and so on) in ~/.config/monitors.xml and want GDM to honor those settings:

Code: Select all# cp ~/.config/monitors.xml /var/lib/gdm/.config/monitors.xml


1 Debian Gnome3 does not create ~/.config/monitors.xml
2 according to dconf editor

the location is


and I tweaked, but no success.

[URL] .... method can be applied to GDM3 directory.

Since I have configured my x rortation only be xrandr command by shell init script, and never had configured by GUI setting, the monitors.xml was not created. When I done with GUI, the file is created as usual.

Then I copied to


Finally works as expected.

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Debian Multimedia :: Gdm3 Does Not List Users At Log In Screen

Sep 1, 2015

I'm using jessie and since I upgraded from wheezy, gdm3 no longer shows a list of users in the logon screen. (I can still log on by selecting "other users").

I had previously had the same symptoms on wheezy, but had fixed it by changing "UID_MIN" to 500 in /etc/login.defs

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Debian Multimedia :: Gdm3 Hangs After Changing User Name?

Jan 15, 2011

I changed my user name with the following commands:usermod -l $newname $oldnamegroupmod -n $newname $oldname usermod -d /home/$newname -m $newnameAlso replaced every instance of /home/$oldname ith /home/$newname in ~/.config.Now gdm3 hangs with a black screen and wristwatch icon. (I can move the icon with the mouse.) This worked fine with gdm. I've looked for gdm3 files that have /home/$oldname in my home and in /etc and couldn't find anything significant.Anyone have any ideas or suggestions on how to fix this or where to look? For now, I've disabled gdm3, and I'm using startx. This is an installation in virtualbox. I just tried using ctrl-alt-F1, but it dropped me to console in the host system. (Nice rush of adrenaline came with that.)

The only errors in Xorg.0.log are there even with a successful startx. (EE) Failed to load module "xboxvideo" (module does not exist, 0)(EE) open /dev/fb0: No such file or directoryCouple more bits of relevant information - this was a live-build that I installed using refractainstaller. I also changed /etc/inittab to disable auto-login. Here are the changes, original lines commented out, new lines look like the inittab in my regular squeeze install, but I don't think this is the problem (see below.)

#1:2345:respawn:/bin/login -f user </dev/tty1 >/dev/tty1 2>&1
#2:23:respawn:/bin/login -f user </dev/tty2 >/dev/tty2 2>&1
#3:23:respawn:/bin/login -f user </dev/tty3 >/dev/tty3 2>&1


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Debian Multimedia :: Gdm3 Black Screen With Cursor After Upgrade

Oct 25, 2015

Yesterday I done an upgrade with apt and since that time whenever I boot up I am presented with only a blank screen and an unresponsive cursor. I cannot switch console using Ctl+Alt+F*. The only thing I can do is Alt+SysRq+(R,E,I,S) which kills gdm3 and gets me back to the console.

* I can get into Xorg fine via the startx command
* As a temporary fix, if I enable automatic login (via /etc/gdm3/daemon.conf) then gdm3 works.

But I can't get the normal authenticated login screen to work.

Output of journalctl for a failed attempt at running gdm3 with verbose debugging enabled:

Code: Select allOct 25 01:24:43 [hostname-removed] systemd[1]: Starting GNOME Display Manager...
Oct 25 01:24:43 [hostname-removed] systemd[1]: Started GNOME Display Manager.
Oct 25 01:24:43 [hostname-removed] gdm3[15863]: Enabling debugging
Oct 25 01:24:43 [hostname-removed] gdm3[15863]: Changing user:group to Debian-gdm:Debian-gdm
Oct 25 01:24:43 [hostname-removed] gdm3[15863]: Successfully connected to D-Bus

[Code] ....

One other thing worth noting, before upgrading yesterday, I changed mirrors and accidentally pasted in "stable" into /etc/apt/sources.list. So basically I did an initial upgrade, realised my mistake, switched back to testing (which I was on before) and done another upgrade, which is when I noticed this problem.

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Debian Multimedia :: Gdm3 Conf File, Where Are The Themes Located?

Apr 26, 2011

In the gmd3 greeter.conf-defaults file its tells me the themes are located /desktop/gnome/interface/gtk_theme, but wheres that directory actually at, like how I can find it?

Btw, I know I can go back to gdm, but I'd rather understand how to theme this, before. I might just.I'm using compiz, btw, if that makes any difference.

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Debian Multimedia :: Change GDM3 Login Window Theme

Aug 2, 2011

I just installed successfully Wheezy, but I can't change my Login Window Theme.I put the three files (.desktop .xml and.jpg) in/usr/share/gdm/autostart/LoginWindow/),I think that my mistake is here but I don't know where to put the .xml file and the .jpg files.And the I edited the file/etc/gdm3/greeter.gconf-defaults.The background is well-displayed but the "theme" is still the same.

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Ubuntu :: Multiple X Sessions On Multiple Monitors?

Jul 12, 2010

So essentially, I have 3 monitors and i'm attempting to run 2 different window managers/sessions at once split up on the monitors. It is intended to be like this:

[GNOME/Compiz - Screen0]
- Left Monitor[code]......

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Debian Multimedia :: Got Slim Running - No Sound, On Gdm3 Sound Works?

Jul 5, 2011

Running Compiz as a standalone WM.Managed to get Slim working, will post how later, but have no sound. If I boot using gdm3 the sound works. Obviously gdm3 loads something Slim doesn't, but can't workout what!Tried adding /usr/bin/pulseaudio --start --log-target=syslog & to my script - no dice, still no sound

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Ubuntu :: Multiple Guest Sessions (More Than Once)?

Jul 9, 2010

Is it way to have more "guest" sessions (more than one)?

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Ubuntu :: How To Run Multiple Graphical Sessions

Aug 21, 2010

I'm trying to run multiple Graphical sessions. How can I do this? I have read the forum article from 2006 but I get an error when executing startx --:2 [URL]
When I follow this howto, this is the error I get
# startx --:2
Fatal server error:
Server is already active for display 0
If this server is no longer running, remove /tmp/.X0-lock and start again.
Please consult the The X.Org Foundation support at [URL] for help.
ddxSigGiveUp: Closing log

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Ubuntu :: Will It Be Possible To Maintain Multiple Sessions

Oct 4, 2010

Will it be possible to maintain multiple sessions from Ubuntu?Actually we are working on one open source application and we have setup this application on one of our Ubuntu machine and this would act as a server for other developer's windows machine. Is any utility available(preferable open source) using which we will be able to access the Ubuntu server from all 4-5 developer's Windows machines?

Our requirement will be to access the whole system including console and GUI (same like remotely access) by using different sessions so that all 4-5 developers can start work together on the same Ubuntu machine.

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Software :: Multiple Sessions With Different Resolutions

May 9, 2011

I just bought a tablet, I would like to VNC to my machine with a lower screen resolution to match my tablet. Right now I use x11vnc on Ubuntu 10.10, and I was thinking to start another session using "startx" but I see there are parameters for display depth but not resolution.

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Applications :: Writing Commands To Multiple Sessions?

Jul 12, 2010

I am using putty to connect to some servers. Is there a program that let you connect to say three servers and when you write your commands to server1, server2 & 3 also gets the command? So I don't have to log in to all three servers to do the exact same thing.

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Ubuntu :: Music Playback Between Multiple X Sessions

Apr 13, 2010

I use two x session, one for xbmc and the other for my desktop, that I can switch with CTRL+ALT+F7 or CTRL+ALT+F8. I start music in xbmc xsession and then switch to my desktop. When the track is finish the next track don't play, i must to come back to xbmc xession and automatically the next track is playing. I would like to have music all time when I'm not in xbmc xsession but in desktop xsession.

Ubuntu 9.10 x86_64 2.6.31-19-generic
ATI Radeon HD 4200 512MB (ATI Catalyst drivers 10.2)

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Ubuntu Networking :: Vnc4server Starts Multiple Sessions?

Jul 1, 2010

if i stop that session, and come back later, it will have me log on at the login screen, but start a new session, with multiple instances of, with vino, i could just keep the same session running, and when i VNC in, it just resumes it.. This one starts a new one.. i even tried just locking the screen, and it still starts a new one...i know there is an easy fix.. lol.. i just cannot find one.. i REALLY like how it shows me the ubuntu login on my server.. that is slick, so id like to keep that, if possible.

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Ubuntu :: Multiple X Sessions - Auto Login 2 Different Users

Oct 11, 2010

I have a small problem regarding multiple X sessions. I want 2 X sessions started automatically on boot with 2 different users auto logged in and 2 different sessions running.

On first X session I would like to have gnome running with user1
On second X session I would like to have xbmc running with user2
So far my computer logs user1 in to a gnome session via gdm on boot. But then I have to launch a tty, log in as user2 and then start xbmc in a new X session.

How to make it work? I would also love to have the second X session active after boot. I am running Ubuntu 10.04.

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Ubuntu :: Multiple Desktop Sessions - Screen Goes Out Black

May 4, 2011

I want to be able to run multiple desktop sessions, but when I goto the next session terminal and type startx -- :2 the screen just goes all black.

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Oct 5, 2010

Here's the setup: One x86 server (Red Hat 4) with two serial connections to an embedded linux device. One serial connection is to a power control so the device can the restarted, and the other is used for a console to this device. Both serial connections use minicom. People on my team VNC to the x86 server, where they find the two minicom sessions waiting for them as they are left open. I would like to automate connecting to the server and communicating over the serial lines.

Supposing I use ssh to the x86 server, could minicom be used over the serial lines without terminating the minicom processes seen through VNC? If not, is there a way to re-open those windows from within the ssh session, so a user who VNCs to the server won't have to reopen them? Could a single ssh connection control two minicom terminals simultaneously, or would there need to be two ssh connections? It is assumed a user and the automated process will *not* try to access the device at the same time; the automation would trigger during off hours.

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Feb 28, 2010

I currently have a RHEL 5.4 software development server. A lot of my developers are using windows desktops and they need to run interactive sessions on the server. I need to support between 4-6 concurrent users on the server. I tried doing this with VNC but I was never able to set that up for more than one user at a time.

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General :: Launch Multiple Screen Sessions From A Single Bash Script?

Jul 11, 2011

I've written a script (that doesn't work) that looks something like this:

screen -dmS "somename" somecommand
for i in {0..5}; do
screen -dmS "name$i" anothercommand $i

For some reason, if I copy and paste this into a terminal, it creates 7 detached screen sessions as I expect. If I run it from within a script, however, I get only the first session, "somename," when I run screen -ls.

Edit: If the same can be accomplished another way (e.g. with multiple screen windows instead of sessions), I would be open those solutions as well.

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