X2Go - everywhere@home

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====== FAQ ======

For those who want to find reasons for certain behavious of X2Go, read here: [[http://wiki.x2go.org/doku.php/wiki:development:debugging|How To Debug or Troubleshoot your X2Go installation]]

===== Server FAQ =====

==== Is X2Go compatible with nomachines NX or freeNX? ====

No even though X2Go uses the same libraries, X2Go aims for an even greater integration into the Linux environment. It’s not possible to use NX client to log on to an X2Go server and vice versa. 

==== Can I install FreeNX and X2Go Server on one system? ====

Yes - the NX libraries of X2Go are actually the most recent versions of NXv3 libs available (including our own patch set). NoMachine is about to drop the NXv3 development branch completely and NXv4 will be released as closed source only :-(.

Due to these circumstances in the future the X2Go project will be upstream source for NXv3 libs for quite some distributions like Debian or Ubuntu. 

In former times the NX libs shipped with X2Go installed into an X2Go'ish location so that they would not interfere with the original NX libraries. 

Nowadays the NX libs shipped with X2Go work as a replacement for the NXv3 that are not maintained by NoMachine anymore.

(This FAQ article has been written by Mike Gabriel, if someone does not agree with the given information on NoMachine, please be so kind to contact me, so that we can discuss it and possibly correct errors in the given information).

==== What is the difference to LTSP? Why a free thin client environment? ====

LTSP requires a high bandwidth on your network. It can efficiently be used in Local Area Networks (LANs) only. 

However, X2Go is not a mere solution for local area networks, but it also allows for the integration of a mobile network into the system. Nomachine’s NX libraries - used by X2Go - enable the transport of whole desktop sessions over a narrow bandwith connection through the internet. 

Further bonuses of X2Go are that you can pause a desktop session and take it to a different thin client for further use. 

==== What are the packages x2goserver-home and x2goserver-one for? ====

Both packages (''x2goserver-home'', ''x2goserver-one'') are obsolete as of April 2011. They have been removed from the current .deb repositories and they should not be used anymore (in fact they break your system). On .deb based system they will automatically be uninstalled with an update of the ''x2goserver'' package.

X2go Server currently does neither have any group membership restrictions any more as former versions had. This may well be re-introduced, though, if someone picks up work on that.

The obsolete ''x2goserver-home'' package added all known users on the server system to the group ''x2gousers'' which made some people nervous when testing X2Go on production systems :-/. For this reason we have dropped the auto-adding of users to groups in Apr 2011.

==== Do I need a PostgreSQL database to run X2Go Server? ====

No. The postgres database is only needed if you are planing to use more than one connected server (server array). By default X2Go Server installs with SQLite3 support enabled. To set up X2Go with PostgreSQL as DB backend you have to edit the X2Go Server's configuration in /etc/x2go. 


===== Session FAQ =====

==== How do I change the keyboard layout? ====

Although some tools (e.g. Gnome Keyboard Indicator) might have trouble changing the layout, you should be able to change the keyboard layout using setxkbmap.
<code>
setxkbmap de
setxkbmap us
</code>

==== Ubuntu's and Fedora's KDE won't resize the desktop to the window size requested by X2Go Client. How can I fix this? ====

This happens because of a package called ''kscreen''. If you encounter an X2Go session trying to launch KDE and this KDE session won't resize properly to your client-side screen or session window size.

In general, this is not a bug. Using two applications that handle display
resolution is not supported, as it can lead to many unexpectable situations and
race conditions.

On machines that act as X2Go Server only, it may make sense removing the kscreen package completely. This, however, may have an effect on your X2Go server's plug'n'play capabilities. The ''kscreen'' package handles hotplugging of display hardware. So if your X2Go Server machine is used locally, as well as via X2Go, consider well, if it is ok to remove that package or not.

For X2Go we suggest disabling the KScreen KDED module (System Settings ->
Startup and Shutdown -> Service Manager, uncheck "KScreen 2") in the user's profile, since X2Go
handles resolution switches for you. To manually change output settings (rotation, enabling/disabling outputs etc) use the KScreen KCM.


==== How do I customize font sizes in X2Go sessions? ====

Some people have asked for font size customizations in X2Go session windows. Please use the DPI value in the session setup to customize font sizes within your X2Go sessions:

  * 70 DPI -> quite readable fonts
  * 90 DPI -> the default font size
  * 120 DPI -> miniature font size

==== File and folder sharing has stopped working since Apr 2011 (approx.). Why? What can I do about it? ====

Add users that shall be granted X2Go file and folder sharing functionality to the "fuse" group on your system (openSUSE/SLES users: to the "trusted" group). For user foo this may look like this at the command line:

<code>
$ adduser foo fuse
</code>

<code>
# if an SUSE + derivatives
$ useradd -G trusted foo
</code>

==== How to run multiple Firefox in different sessions in paralell? ====

This KB article shows one solution for this:

[[http://kb.mozillazine.org/Firefox_:_FAQs_:_Run_more_than_one_instance_in_Linux| kb.mozillazine.org/Firefox_:_FAQs_:_Run_more_than_one_instance_in_Linux]]


===== Client FAQ =====

==== Is there an MS Windows Client? ====

Yes, there are two: [[doc:installation:x2goclient#ms_windows|X2Go Client]] and [[doc:installation:pyhoca-gui#ms_windows|PyHoca-GUI]].

==== Is there a MacOS Client? ====

[[doc:installation:x2goclient#macos_x|Yes!]]



==== Why is there no sound using Linux? ====
Probably because the server does not listen to client connections. Check whether the file ''/etc/pulse/default.pa'' on the client contains the line:
<code>
load-module module-native-protocol-tcp auth-cookie=".pulse-cookie"
</code>
If not, add it. Alternatively you can load the module at runtime:
<code>
pactl load-module module-native-protocol-tcp 'auth-cookie=".pulse-cookie"'
</code>


==== Can I use x2goprint with Windows Clients? ====

To set a print target, you'll need ''x2goclient''. For example you can use the RDP tunneling feature of X2Go. FIXME

===== Known Issues =====

==== Can't login to x2goserver with an ECDSA key ====

At this time libssh, the ssh library used by X2Go is unable to work with an ECDSA key.
However you may use an RSA key--if you need to--or go with the SSH default authenticating method using the remote user's password.

==== SSH Login issue ====
If you already use openssh to get a shell on your x2go server, you may get this message when trying to connect with x2go:  
<code>
The host key for
this server was not found but an othertype of key exists. An attacker
might change the default server key to confuse your client into thinking
the key does not exist
</code>

This is related to the ECDSA Key (see FAQ above). 
To solve this issue, you can disable ECDSA keys on your ssh server configuration, by commenting the following line in /etc/ssh/sshd_config file: 
<code>
#HostKey /etc/ssh/ssh_host_ecdsa_key
</code>
Then restart ssh service. 
Now you should not get the error message anymore. 

===== 3rd Software Known Issues =====

==== Eclipse do crash on Debian Wheezy ====

Eclipse crashes on Debian Wheezy due to cairo lib, as explained on http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721181.

Explained on that bug, and its links, is how to solve this by updating to cairo library from jessie, or modifying a line on /usr/bin/eclipse script, changing last line:
<code>
exec $ECLIPSE "$@"
</code>
with:
<code>
exec $ECLIPSE -vmargs -Dorg.eclipse.swt.internal.gtk.cairoGraphics=false "$@"
</code>

==== Libreoffice performance ====

If when using Libreoffice, text selections and copy/paste operations make your X use lots of cpu, disable anti-aliasing and selection transparency on Libreoffice options.

==== Mate and numlock erratic behaviour ====

If using Mate DE, your numlock key makes numeric keyboard act in a numeric manner or as a moviment keys, disable the dconf setting with:
<code>
gsettings set org.mate.peripherals-keyboard remember-numlock-state false
</code>
Another interesting setting is:
<code>
gsettings set org.mate.peripherals-keyboard numlock-state 'on'
</code>
Lastly, you can tell X to always use numeric pad as digits, on keyboard options.


==== R graphics ===
Using an buffered X-window and reducing the update rate can significantly improve performance for complex graphs. 
<code>
#Only update Window every 5 seconds (you have to play with this value)
options(X11updates = 5)
#Open a new X-Window with buffered window
X11(type = "dbcairo");
#Everything following this line will be drawn into this window.
</code>
X2Go - everywhere@home

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