Ubuntu Installation :: How To Get XDMCP Up And Running On 11.04
Jun 20, 2011
I'm on a private network and would like to have XDMCP turned on so different users can access the system with a greeter and log in to their own desktop.To test if this works, I've tried 'Xnest :1 -query localhost' - which on other _nix systems will bring up the greeter, then I know that all I have to do is deal with firewall issues, etc. On Ubuntu 11.04 I just get a blank screen.I've seen others asking for help with XDMCP, and the answers are to use VNC, which from my experience allows you to _share_ the current desktop, not create a new one for a different user to use at the same time. If I am mistaken please let me know.So, any ideas on how to get XDMCP up and running on Ubuntu 11.04?
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Jun 17, 2010
I always notice that xdmcp always runs on my system. I don't want it to. These are my settings and I tried to reboot. xdmcp still runs. How do I stop it once for all.
/etc/sysconfig/displaymanager
DISPLAYMANAGER="kdm"
DISPLAYMANAGER_REMOTE_ACCESS="no"
DISPLAYMANAGER_ROOT_LOGIN_REMOTE="no"
[code]....
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May 13, 2010
I want to run a system that acts as a basic file server, I want to remove the graphics card for the sake of power saving and less heat in the box. My machine can boot without the GPU, and I can ping it and use putty to do things, but I'm still new to Linux and don't really know what I'm doing so GUI is best for me atm.
From somewhere I picked up that this is possible (the XDMCP server machine can have no GPU). This post here [URL].. seems to be what I am looking for, but I don't know how to "convert" these instructions to Ubuntu (the files mentioned do not exist on my install anyway).
[Code]...
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Nov 30, 2010
I need to setup a xdmcp server on ubuntu 10.10 to allow for remote connections. Obviously this cant be done from the login window as with previous versions of Ubuntu.
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Jun 25, 2009
on Debian/Ubuntu in the login form (i suppose it's "gdm") from the bottom right corner I can pick the option to login to a remote XDMPC desktop (that of course I enabled on the other side..) the network is checked for those open XDMCP service and finally, the login box appears and i can remotely login to a "graphic terminal".
How can I do the same in Fedora? I found some guide about Xnest, Xzephyr, but I was totally unable to find a way for doing this simple task.
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Jan 5, 2011
I'm trying to use xmms (or any other audio player) lauched from a remote computer but playing locally. I have a maverick server which has xmms installed. I launch an xdmcp (starnetssh) from a windows machine and I am able to open terminals, panels, emacs, etc but when I open xmms (or MOC, is the other one I tested), it simply doesn't play anything unless the same user is logged on the ubuntu box.
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Jun 13, 2010
I heard that window managers like xdm, kdm and gdm etc use xdmcp protocol which is inherently unsafe. Now I have an Xclient that has to be displayed on multiple Xterminals. Can I do this without gdm/xdmcp. Shouldn't the regular X work in this case. What exaclty is the purpose of gdm/xdmcp on top of X. So if gdm provides the complete desktop manager, does this mean it is unsecure since it uses xdmcp?
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Feb 21, 2010
This applies to GDM as well, but I'm using KDM right now so:
Linux 2.6.31.12-174.2.19.fc12.x86_64 #1 SMP x86_64
I setup XDMCP:
/etc/kde/kdm/kdmrc
[Xdmcp]
Enable=true
Willing=/etc/X11/xdm/Xwilling
Xaccess=/etc/X11/xdm/Xaccess
[security]
AllowRemoteRoot=true
DisallowTCP=false
/etc/kde/kdm/Xaccess (link to the xdm 'xaccess' file) includes:
* CHOOSER BROADCAST
In KDM settings I set it to 'no theme' and 'no custom background'. IPTables & SELinux are both off. The client & server are both on the same switch. I can connect successfully. But all I get is a black screen & an X cursor, never get to see the login prompt. Most things I find have to do with the inability to connect at all, but this connects. I'm having this problem on RHEL5.4, CentOS5.4, & Fedora 12. I'm troubleshooting it on Fedora though. I'm not able to even log in.
I must point out that for CentOS5/RHEL5 I got this working, but I didn't do anything differently that I know of. I just repeated the same process over again....but I'm using GDM on those. Is it possible that I may have to use GDM for KDE because it works with GDM? I'd like to get KDM working because that's what it's designed to do right? work the way it's configured. I've not had a chance to look into it with KDM since the time that I posted this thread.
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May 6, 2011
I had Xming working great with XDMCP on my Debian 6 server at work. I had to replace the UPS and when I brought the machine back up xming/XDMCP no longer worked correctly. When I launch Xming and connect to XDMCP session I get the Xming window, the X Cursor but the GDM login window never appears. So I am getting some level of connectivity. The only change that was made to the server was that OpenVPN service was turned on. I do not know if this is the right log to be looking at but /var/log/gdm3/:0-greeter.log has this in it a number of times:
(polkit-gnome-authentication-agent-1:2252): polkit-gnome-1-WARNING **: Error enumerating temporary authorizations: Remote Exception invoking org.freedesktop.PolicyKit1.Authority.EnumerateTemporaryAuthorizations() on /org/freedesktop/PolicyKit1/Authority at name org.freedesktop.PolicyKit1: org.freedesktop.PolicyKit1.Error.Failed: Cannot determine session the caller is in
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Jun 25, 2010
We have a lab at our school that has DevonIT thin clients. We want to connect to Ubuntu via xdmcp or freenx from these clients, and we want users to be able to connect to our Novell file server from these clients. I can't find instructions on how to install the client, which I found at KDE-Apps.org. It is a tar.gz file. I'm not new to Linux, but rarely install apps from source. Could someone walk me through it, keeping in mind I do not use the command line much? [URL]..
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Jul 17, 2015
I'm trying to get an laptop running more or less like a headless server, my reasons are not all that serious. Mostly I want to leave the laptop running as a seed box when my main PC is turned off, also want to setup it up as a media top, common place for media files and playback on Tv. So essentially I want to be able to access the remote machine, preferably sharing the same session and persisting while I log out from remote.
What I've done:
setup keys for ssh to connect automatically between machines, so I can login via terminal, access the file system without issues, which is already a great step. enabled remote access on remote machine lightdm manager setup deluge for daemon torrenting, which enables almost seamlessly client to connect remotely (though deluge is not the best with speed)
What I've tried so far:
Connect directly with a new X session
Code: Select allX -query your_server_ip :1
Works alright, creates a new display (:1) which is oddly in F2 tty instead F8 as is expected. Works alright, not much lag, audio is not routed.
But an issue! whenever I decide to log out X will simply shutdown, screen goes black and I can't resume on my regular session on my local machine.Connect X with nested Xephyr session
Code: Select allXephyr -query your_server_ip -screen 1280x1024 :1
This works too and might be the best solution yet, a windows is created and the remote session is nested in your current X session. Visual and performance is ok. Only real issue is that session is not shared, eg, application will not remain running...Connect via VNC
So it seems only solution for shared sessions is VNC.
With the remote desktop apps from KDE (which is the DE for both), I can connect buzz around and etc, but its kinda cumbersome and laggy, password always resets and I usually need to accept on the remote machine.
I've tried setting up lightdm to allow a vncserver at logon, but this is erratic at best, took a long time to get the Xvnc command correct enough for me to login remotely, and even then got a garbled screen and the X session wasn't even the same...
So that's it... Isn't there a way of regular X session sharing in the remote computer? Or a better solution for lightdm vnc invoke?
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Jul 22, 2010
How can I manage to avoid double login to a user account in the server by remote users? Is there a way to block it or to hide logged user accounts?
I have two server, one f12, the other f13 (behind a firewalled router) and want them to serve desktops to anybody in the local network. User accounts in both servers are established as username: user1 password: user:1 , username: user2 password: user2 ....... Every remote user should take an available user on server but no multilogin to the same user. Remote users are no adult so they can mistake. That's the problem. On the remote dektop section unmark everyone can see my desktop didnt help.
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Nov 8, 2010
on a openSUSE-11.3 how do I configure lxde so I can access it via a remote XWindow server via xdmcp?
Entry /etc/sysconfing/displaymanager:
DISPLAYMANAGER="lxdm"
DISPLAYMANAGER_REMOTE_ACCESS="yes"
Entry in /etc/sysconfig/windowmanager:
DEFAULT_WM="startlxde"
[Code]...
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Mar 16, 2010
I've been used to using RDP on Windows to remote to machines, and I've got an asus eee 701 which I want to use to do some *nix programming on. While the eee is a lovely little machine the screen and keyboard are a little small to use for lots of programming. I've tried using Xming (the free version) to remote login into the eee from my desktop using XDMCP (or even using a ssh session as a straight X11 server and no desktop on the eee) the whole thing seems seriously slow over wifi the initial desktop takes at least 5 seconds to paint (might even be 10 seconds I haven't actually timed it). So my real question is what do other folks use for remote control with a GUI for their *nix boxes? I am finding it hard to believe the performance is so bad over a wifi network (It makes the Mac IIs I used to use a college in 1988 seem fast) or is this just a problem with Xming and using say the Cygwin X11 server would be better.
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Jun 16, 2010
I am going through cygwin's XWin.exe (XWin - queary <hostname>) to start a remote session with a RHEL 5.5 workstation. I have run gdmsetup on the worksation to allow the remote connection. Starting the remote session goes off without a problem. After about two hours, it just exits and I have to start over. This is a problem since all my gui's are killed and I have some important processes running.
/var/log/syslog/messages shows:
Jun 15 16:49:53 <host> gconfd (root-12016): SIGHUP received, reloading all databases
Jun 15 16:49:53 <host> gconfd (root-12016): Resolved address "xml:readonly:/etc/gconf/gconf.xml.mandatory" to a read-only configuration source at position 0
Jun 15 16:49:53 <host> gconfd (root-12016): Resolved address "xml:readwrite:/root/.gconf" to a writable configuration source at position 1
[code]....
There must be a 2 hour timeout set somewhere - maybe in a gconf xml file?
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Apr 3, 2011
I use XDMCP from an old laptop to login remotely to another computer which is running Debian 6. This seemed to work fine in Debian Lenny, and the laptop screen would switch off after a period of inactivity as I expected. Now the laptop screen blanks after inactivity, but the backlight never switches off.
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Feb 17, 2010
I have one Linux PC installed with Suse 11.1. In this I have created three users to get access.
Users able access their login from Windows PC via some utilities.
1. Putty
2. Xming
Users able login using both. With Putty there is no GUI. But with Xmings XLaunch they are able to get similar session as Linux Host PC. At this point of time the host linux PC will become too slow in perfarmance.
How to retrict the users not to open similar session by enablin/disabling some setting in Linux PC?
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Jul 16, 2015
I want connect from remmina to jessie on another system via xdmcp but only black screen happened.
my daemon.conf
Code: Select all[security]
DisallowTCP=false
[xdmcp]
Enable=true
[debug]
Enable = true
And gdm3 listen on udp/177. My syslog :
Code: Select allJul 16 10:17:46 office /usr/bin/dbus-launch[1455]: X Error of failed request: BadValue (integer parameter out of range for operation)
Jul 16 10:17:46 office /usr/bin/dbus-launch[1455]: Major opcode of failed request: 140 (RANDR)
Jul 16 10:17:46 office /usr/bin/dbus-launch[1455]: Minor opcode of failed request: 7 (RRSetScreenSize)
Jul 16 10:17:46 office /usr/bin/dbus-launch[1455]: Value in failed request: 0x0
Jul 16 10:17:46 office /usr/bin/dbus-launch[1455]: Serial number of failed request: 150
[Code] ....
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Mar 20, 2010
I am using Fedora 12 and i have enable XDMCP i have boot client with dhcp all is going well but when remote user logout than remote client display XDMCP: fatal error: Session declined Maximum number of open sessions. and after that i have reboot Fedora 12 server than it will work but after logout it will again create same problem.
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Apr 8, 2010
I recently got my hands on a brand new Packard Bell EasyNote NJ65 laptop which comes with Windows 7 Starter and I wanted to give it a try with Karmic Koala, since my old laptop (Compaq Presario F564LA) could run it with no problems.
When I tried to install or even, to run the LiveCD the computer just freezes. Simple as that. I've tried any posible solution but so far, I've been all out of luck. A quick round of Google searching has failed to provide any answer to my question, so that's why I came here.
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Jun 22, 2011
I'm trying to perform an install of F14 (fresh install over F13), and it has been showing "running post-installation scripts" for 1 1/2 hours now. I am wondering if this is unusual and what the implications might be of power-cycling and rebooting. I'd note this is a fairly fast machine with 2 quad-core Xeons (I forget their model number).
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Apr 22, 2011
i am trying to dual install fedora 14 alongside my current windows 7 home premium 64-bit. the main issue that i am having is when running the DVD you cannot see anything on the screen during the installation process so i can't see what i'm doing. other than that the DVD works correctly as far as i know. i have downloaded the iso twice and burned two separate disks and have had the same problem with both disks.
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Mar 29, 2010
I have a 4 Gb USB stick on which I have a few different distros and flavours etc (see end for how I made the disk). There is a generic boot and gfxmenu folder to give the boot options. For each distro / flavour I then copy the OS files from the .iso and add the relevent lines to menu.lst in boot. This system normally works perfectly. I tried to add UNR to the list (for a netbook I have), but failed, perhaps because I copied the wrong files across:
From the UNR.iso I copied:
A) casper/filesystem.squashfs and renamed UNR.sqfs
B) isolinux folder and renamed UNR
C) casper/initrd.lz and casper/vmlinuz to UNR folder on stick
D) Adding these lines to the boot/grub/menu.lst:
Unfortunately I get dropped to an ash shell after the system complains that it 'Gave up waiting for a root device'
Anyone got any ideas how to resolve this issue. I would really like to have UNR on the stick along with the other linux flavours so I can show people with netbooks its potential.
Full Instructions for multiple liveUSB:
1) Format the USB drive with ext3 without any partitions
2) Copy the OS files from a liveCD or mount the image and extract the isolinux dir and livecd.sqfs to the USB
3) Creat 2 folders- USB:/boot and USB:/gfxmenu
4) Copy /boot/grub/ folder from a running linux install into the USB:/boot folder
5) Copy /usr/share/gfxboot/themes/pclinuxos/boot/message to USB:/gfxmenu
6) Modify USB:/boot/grub/menu.lst to:
7) Install GRUB to MBR of USB:
If you want multiple boot images then repeat step 2 for each (assign each pair a unique name) and then add relevent stanzas to menu.lst:
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May 3, 2011
Is there ANY way to get PHP 5.2 running in Ubuntu 11.0.4?? I have tried everything and cannot figure this out.. We have an app that just will not play well with PHP 5.3 at all..
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Jul 19, 2010
Tonight I installed Lucid(10.04) on my laptop, which is a VAIO VPCCW. The first problem I faced was the blank screen when trying to install Ubuntu. That was solved by pressing F6 and activating "nomodeset" Afterwards, I had to edit Grub, removing splash and quiet and adding nomodeset, to get it running.
Because of the low resolution and lack of support for effects, I intalled the proprietary driver for nvidia and restarted. Now I'm getting a message saying the display cannot be found etc and it is running is low graphics mode. When trying to open nvidia-settings, I get "You do not appear to be using nvidia X driver. edit your X configuration file(just run nvidia-xconfig as root) ... " And obviously, running nvidia-xconfig as root didn't change anything.
I was forced to move to Windows a month ago as a result of this issue(bought a new laptop) and now I see the problem is not resolved yet.
Btw, OS: 10.04 64bit Graphics Card: NVIDIA
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Aug 29, 2010
My only OS is Ubuntu 10.04. There are no partitions ( that is, I use the entire hard drive for Ubuntu, obviously). I need to run Backtrack for security testing. I've seen lots of various options from running it in virtualbox to running it from a bootable USB but there seem to be problems originating with the grub bootloader. One thing I keep seeing is that the only way to get round all this is to hard drive install Backtrack first and THEN install Ubuntu. Clearly I don't want to have to reinstall my entire world on my pc, play with settings, re-install a billion apps etc.
My question is this - Given that I have 10.04 installed and running alone, how do I get Backtrack installed/running easily and without all the associated disasters? I like the USB option because the thought of screwing the grub up does not appeal; I don't want to reboot my computer and be told "I'm grub and I don't want you to load anything" / Other Annoying Message.Backtrack's site says they didn't provide a USB option so what should I use to burn the ISO (does Unetbootin work for Ubuntu?
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Jan 5, 2010
My laptop pc is corrupted and it wont start up Windows and my cd rom is fried it wont work. The only way to use the pc is to run slax or any distro of Linux by USB. I want to fully install Ubuntu on the laptop but the install file is .exe and wont open up with Linux. I would like to know if there is a way to download and fully install ubuntu on my pc via USB.
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Mar 24, 2010
I am getting the following upon booting up after upgrading from 9.10 to 10.04 Beta:
Ubuntu is running in low-graphics mode. The following encountered. You may need to update your configuration to solve this
(EE) intel(0):[drm] failed to set drm interface version
(EE) intel(0):Failed to become DRM master
(EE) intel(0):failed to get resources:Bad file descriptor
(EE) intel(0:Kernel modesetting setup failed
(EE) Screen(s) found, but none have a usable configuration.
I then press the OK button (no other option given). Then I'm presented a menu with the following options:
(x) Run Ubuntu in low-graphics mode for just one session
( ) Reconfigure graphics
( ) Troubleshoot the error
( ) Exit to console login
( ) Restart X
Cancel and OK buttons. I choose OK and the system seems to boot ok.
I'm not sure what is wrong or how to go about solving this one.
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Apr 28, 2010
How do you actually install ubuntu? I cant figure it out, its nothing like windows! I download the unetbootin to make a boot usb drive.. I did that but when it boots it ask goes blue with a thing flash default. Then it asks me to press tab, when I do that it comes with a cmd. What should a write? If I click esc on the keyboard it brings a cmd line. If I write like E:dir it says kernel invalid. What is a cmd that runs the cd on a boot for ubuntu. How hard is to install it??
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May 2, 2010
I installed the Nvidia driver. When I click on the "Monitors" package it then asks if I want to use my graphics drivers vendor's tool. I say yes and then it pops up the Nvidia X Server Settings dialog. In that menu it indicates I need to run nvidia-xconfig from root. I did this and then restarted the xserver but to no avail I get the same message every time I try to run "Monitors", that I need to run nvidia-xconfig.
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