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2322 discussions

Started getting weird error: Connection failed. Cannot open display "default display"
by Nicu Stiurca 26 Nov '13

26 Nov '13

Hi all, I'm not sure if this is the right place to post a problem like this. If it's not, kindly redirect me to the right place. The problem: I was working last night using x2go to remote into a server. I got disconnected, and upon trying to reconnect, I started encountering the following error: *Connection failed* Cannot open display "default display" That shows up in a pop-up window whenever I try to connect to the server. In the console, I see the following text right before the error window pops up: start new ssh connection to server: "<my server>" : "<my port>" krb: false ssh connection ok continue normal x2go session Some additional info: I can still do normal X forwarding on the server with ssh -X. Server is running OpenSUSE 12.3. Clients are running Ubuntu 13.04, 13.0, and OpenSUSE 12.3. I get the exact same error from all 3 client computers I've tried. Any ideas? -- Nicu Știurcă \\//./ Live long and prosper.

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Is it possible to run the X2Go PXE Server (for X2Go TCE) in a Linux-VServer environment?
by Stefan Baur 26 Nov '13

26 Nov '13

Hi list, I tried to install the X2Go PXE Server in a VServer environment. This failed for several reasons: 1) Linux-VServer isn't included in Wheezy any more, so I had to try it using Squeeze. 2) The nfs-kernel-server package cannot be installed in a VServer environment - this is a general limitation of Linux-VServer (http://linux-vserver.org/Frequently_Asked_Questions_scratch#NFS-server) Said FAQ and "apt-cache show nfs-kernel-server" point to the packages nfs-user-server and unfs3 as alternatives. However, in Squeeze, only the nfs-kernel-server package is available, but neither nfs-user-server nor unfs3 are available. 3) unfs3 is available in sid, but only for the m68k platform, not for i386 or amd64. 4) I can't find nfs-user-server anywhere on packages.debian.org (for any release), which means either the package name is wrong or the package no longer exists. So it seems I'm stuck. Other PXE boot solutions use http/ftp instead of nfs and pass along the client root file system as squashfs. I'm not sure if switching to that method would help much, though, as it means having to load the entire root file system into the client's RAM. At present, the file system needs almost 850 MB of space, which would not fit into my clients - they have between 256 MB and 512 MB. Any suggestions what I could try next? -Stefan

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Re: [X2Go-User] Latency Issues
by bmullan 24 Nov '13

24 Nov '13

Mike, Shah et al I've used libturbo-jpeg for a couple years with x2go after I first learned about it. You might check your Distro... but at least for Ubuntu I believe libturbo-jpeg is the default installed by Ubuntu now. */NOTE: in the following - I _did have to_ install "libjpeg-turbo-progs" separately /* On my Ubuntu 13.10 x64 system if I run Synaptic and search for "libturbo" I find: */Independent JPEG Group's JPEG runtime library (dependency package) /* *//* */libjpeg8 dependency package, depending on libjpeg-turbo8./* You might do the same on your Distro to find out what libjpeg is being used today. Brian

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Latency Issues
by Nirav Shah 24 Nov '13

24 Nov '13

Hi, I am using X2Go Client and we are facing Latency issues when developers use it from different country and they use graphics functionalities. How can I reduce this latency effect? Remote machine is Linux CentOs and client is on Windows 7/Mac OS X I have done following based on different forums: 1) Use plain wall paper 2) Removed shared drive, audio support, local print support 3) Change the connection to ADSL Are there any other improvements I can do? -- Thanks, Nirav

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Multimedia over the WAN
by Steve Bergman 23 Nov '13

23 Nov '13

Hi, First off, thank you, so very much, to the x2go team. I support ~100 Gnome (soon to be MATE) desktop users in 4 offices in 3 States using FreeNX, and will be migrating to x2go over the next few weeks as we move to our new Debian 7.2 x2go server. I couldn't continue to do it without you! I'm quite impressed with the multimedia capabilities out of the box. Over the WANs, I can comfortably watch YouTube videos. The video is choppy, but serviceable. And the sound is flawless. Unfortunately, watching the same quality videos in, say, VLC, results in unusably stuttery sound. And even desktop sounds are choppy. The default alert "choing" plays the first few tenth of a second or so, pauses briefly, and then finishes. I assume Pulse Audio is just streaming the sound uncompressed. Is there any way to improve that situation? Any sort of compression (even ssh -C) might be an improvement. Or perhaps there's something that can be done with the buffering? I have managers in remote offices who would have need light usage of multimedia, for viewing multimedia resumés, etc. -Steve Bergman P.S. I enjoyed watching Mike Gabriel's talk from Debconf 13 on youtube, yesterday. I watched the whole thing a couple of times... over x2go from our new server, across town. :-)

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x2go in LXC (linux containers) - how to enable sound
by brian mullan 20 Nov '13

20 Nov '13

I've been doing a lot with LXC containers for the past couple years. One potentially very interesting use of LXC is to implement x2go so each user on a single Host PC can have their own LXC container, their own "desktop" (lxde, xfce, mate etc), install their own applications etc all without any changes to the Host OS or interfering with other user's and their container based Desktop environment. If you are not familiar with LXC ... some of you may have read about Docker lately. Docker is based on LXC. There are many great benefits of LXC virtualization vs the hardware virtualization provided by vmware, kvm, virtualbox. Just a few are: - LXC is an order of magnitude faster from a performance perspective since there is no hardware virtualization involved - LXC containers can be created/cloned in seconds - LXC container's share the HOST OS's kernel so Host PC resource utilization is much less Anyway, LXC containers are extremely easy to create. But a default LXC container is usually used for "server" linux applications. But its simple to add any "desktop" environment you want to that server then also add x2goserver, x2goserver-xsession after which that LXC container becomes a great x2go server environment for a user. It is isolated from the Host OS, you can change whatever you want in it and the Host OS is unaffected. Anyway, the point of this note was to describe one area that took a while to figure out. LXC Containers as mentioned previous were primarily designed for "server" not "desktop" use-cases. As such "sound" was not enabled by default in new LXC containers. note: In LXC any Host OS resource is or is not permitted through use of a CGROUP file for each created Container Even using the Docker "desktop" example: http://blog.docker.io/2013/07/docker-desktop-your-desktop-over-ssh-running-… Sound does not work by default. After 3 weeks of researching, trying various ideas of how to enable sound I finally got it working after some careful reading of the pulseaudio.orgwebsite. I documented how to configure x2go and another post on configuring PulseAudio in the LXC Container to provide Sound on my WordPress blog so to not duplicate things you can find the information here: http://bmullan.wordpress.com/

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Gnome Bindings in Ubuntu ppa disappeared?
by Short, Kermit 20 Nov '13

20 Nov '13

Greetings! I am used to installing the x2gognomebindings package on a system when I install the x2goserver. Today I tried and aptitude returned with package not found. Sure enough, I aptitude search and the package is no longer present. What happened, and is there a work around? -- Kermit Short DCS-5

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Windows compiling pyhoca-gui - gevent issue
by Michael Gale 20 Nov '13

20 Nov '13

Hello, I setup a Windows 7 32bit machine in order to compile Pyhoca-gui for windows. I have everything working thanks to: http://wiki.x2go.org/doku.php/wiki:development:build-howto-mswin:pyhoca-gui However I did run into an issue with gevent. Originally I was using the gevent binary release 0.13.8. However build_exe was failing, bbfreeze was calling multiplath and trying to import gevent.ares and failing. Sorry, I can't get the stack trace to copy/paste. >From what I can tell the ares module was optional, so it may not be in the binary release. Is that correct?? I got a binary release of 1.0b4 and installed it and now it is working. I did a basic sanity test only: - built and exe using build_exe - ran pyhoca-gui in dev mode and started and terminated a session. What I would like to know is what version of gevent was pyhoca-gui compiled with? How can I fix the binary gevent 0.13.8 release? Not sure I want to be running beta releases of gevent. Thanks Michael

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Re: [X2Go-User] X2Go-User Digest, Vol 39, Issue 14
by brian mullan 19 Nov '13

19 Nov '13

Brent. In my experiments with Unity & Gnome I ended up just installing a different Desktop Environment. Mate, Xfce or LXDE are all easy to install and all work well with X2GO. If you are using ubuntu xfce -> $ sudo apt-get install xubuntu-desktop lxde -> $ sudo apt-get install lubuntu-desktop mate which is gnome2 based -> follow this: http://www.ubuntu-news.net/2013/11/13/install-mate-desktop-1-6-with-mintmen… I would assume these work the same on debian

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x2go with gnome-shell >= 3.8
by Brent S. Elmer Ph.D. 18 Nov '13

18 Nov '13

Is there a way to make x2go work with gnome-shell >= 3.8? Version 3.8 removes gnome fallback which is what x2go always used.

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