- Issues and known problems
- Features: How do I...
- Warnings and Messages
- OpenGL Issues
- Why this fork?
This fork started in order to provide features needed to work with winswitch and grew from there.
- Where is the source and repository?
- How do I contribute?
- Why do you use subversion instead of $my-preferred-DVCS (git or other).
Because it is the right tool for the job. (key point: numeric release numbers beat git hashes for non distributed development)
- I don't want to install winswitch.
Then don't. xpra and winswitch live in the same repository, that's all.
- Which version shall I be using?
- I have version 0.3.x or version 0.0.6 installed and I can't connect.
Those are far too old. Use a supported version.
- Should I use the version shipped with my Linux distribution?
It depends, generally not.
- Which versions are supported? Which ones are compatible with which versions?
The current LTS release (0.14.x) is compatible with versions going back to v0.7.8. However, just because it is possible to connect does not mean that you should be using an outdated version. Outdated versions contain known bugs and vulnerabilities.
- What is the license?
- I get a GPG signature warning when I try to install
You probably forgot to import the GPG key before installing the package.
The key signature is:
c11c 0a4d f702 edf6 c04f 458c 18ad b31c f18a d6bb.
Issues - known problems
Please see also: Application Quirks
- Xpra cannot start or crashes
- Xpra crashed! Can I recover my session?
Generally yes, as long as the virtual display server (vfb) has not crashed.
If the xpra server is completely gone, you can start a new one with "
xpra start --use-display" to re-use the existing display. If it is still running but unresponsive, you should kill it first (and use
kill -9 to prevent the tear down code from also stopping the vfb display)
- Why does Xpra use so much of my CPU?
sound forwarding will consume a little bit of CPU and bandwidth. Turn if off if you don't need it. Some applications will also repaint their windows unnecessarily, if you don't use them, try minimizing the window.
- I have keyboard problems
Please see here: wiki/Keyboard
- Clipboard does not work or is slow
Please see here: wiki/Clipboard. Make sure that you are not running a clipboard manager which may interfere with xpra's clipboard synchronization code (ie: klipper is known to cause such problems)
As per above, those tools will do their own clipboard synchronization which will definitely cause problems - try disabling one of the clipboard synchronization mechanism, and if possible, do not layer remote desktop protocols on top of each other
- I cannot click on menus
If you are using Qt/KDE, this is known bug which has been fixed so you will need up to date Qt/KDE libraries, see the platforms section below
- I cannot use Xpra with NFS home
socket-dir option to place Xpra's log files and sockets in a location that is not NFS mounted (ie:
- my opengl application refuses to start with virtualgl
Please see #898
- my applications are missing their menu bar on Ubuntu
Always start your applications with
xpra start --start=APP and not
DISPLAY=:N APP (see #1419)
Features - How do I…
Please see also Usage.
dbus, etc for each session?
Usually, adding this to
/etc/xpra/xpra.conf or the per-user
~/.xpra/xpra.conf is enough (version 0.15 onwards):
start = /etc/X11/xinit/Xsession true
(on some distros
Xsession is found under
Or you may want to add each application individually (one
start-child line per application).
- Use an SSH key with MS Windows clients?
Use pageant: putty FAQ
How do I use all PuTTY's features (public keys, proxying, cipher selection, etc.) in PSCP, PSFTP and Plink?
- How do I use notifications forwarding?
System notifications use dbus, so you must start the xpra server within its own dbus session, see below:
- How do I start a dbus session for the xpra server?
dbus-launch xpra start ... (see dbus-launch for details).
- How can I allow multiple users to connect through a single port?
- How do I forward a full desktop (ala VNC) instead of individual applications?
- How do I use mmap with different users?
Please see the
--mmap-group option: the two users need to be in the same group, the mmap file created by the client will use the group-id of the server socket file. You must generally also use the
--socket-dir option to place the socket in a location which is available to both users (ie:
- How do I theme my application?
That depends on the application. GTK2 applications can be themed by setting the GTK2_RC_FILES environment variable, ie:
- Use Xpra with systemd
Warnings and Messages
cannot find a valid pkg-config package for ['x264', 'libx264']"
You must either install the
x264 development headers (recommended) or compile with the option: "
connection lost: invalid packet header, not an xpra client?"
This is often caused by out of date clients.
Message: pygobject_register_sinkfunc is deprecated (GstObject)"
This harmless warning comes from your distribution's python-gstreamer build, sadly it cannot be avoided.
Xlib: extension "RANDR" missing on display" and "
Randr not supported: X server does not support required extension Randr"
The virtual framebuffer (typically Xvfb) does not support Randr, this may cause some display problems, try using Xdummy instead
loop nesting too deep" and "
you may have a clipboard forwarding loop, disabling the clipboard"
another piece of software is trying to synchronize the clipboard contents (maybe a clipboard manager, or a virtualization solution like vmware or virtualbox) and this is conflicting with xpra's own mechanism, so xpra stops trying to fight with it - you should disable the other clipboard synchronization if you want xpra clipboard sharing
found an existing window manager on screen ..."
Xpra is a window manager, you cannot run two window managers on the same display at the same time. If you want to forward a whole desktop, including its window manager, see Usage: forwarding a whole desktop, otherwise stop the other window manager.
cannot register our notification forwarder ..."
The xpra server was started from a GUI session which already had a dbus instance and a notification daemon, notifications forwarding will not work. See "How do I use notifications forwarding" (above)
re-starting speaker because of overrun"
This usually means that there is too much network jitter and that sound packets are arriving in bursts. You can try a different sound codec (
--speaker-codec option) or just turn off sound if you don't need it. More info here: wiki/Sound
Warning: pulseaudio has terminated. Either fix the pulseaudio command line or use --no-pulseaudio to avoid this warning."
This usually occurs when an xpra session is started from a running X11 session which already has its own pulseaudio server running. Pulseaudio does not support multiple servers per user.
Uh-oh, our size doesn't fit window sizing constraints .."
This means that xpra failed to create a window matching the desired constraints, you may experience display artifacts around the window's borders
dec_avcodec is probably leaking memory"
Your installation should be using
dec_avcodec2 (for ffmpeg version 2 onwards) or it is missing some patches
Xorg is not readable"
Your distribution ships Xorg suid but it is not readable by your current user, since Xpra needs to run Xorg non-suid, it needs to make a non-suid copy of the file so you will have to make it readable (please complain to your distributor - there is nothing we can do about this and the security benefits of preventing read access to a suid binary are dubious at best in most cases).
For more details, see Xdummy.
xpra [errno 2] no such file or directory" when connecting via ssh.
Xpra is not installed on the remote host.
- SSH connection error "
The system cannot find the file specified":
Error running ssh program \ '['ssh', '-T', 'HOSTNAME', '.xpra/run-xpra', '_proxy', ':10']': \ [Error 2] The system cannot find the file specified
This means that the user you login as on the server has never had an xpra server running. You must be using the wrong username or even the wrong server. Try adding the username to your ssh connection string:
xpra attach ssh:username@host
- I get a GPG error:
The key had expired. Try re-importing the updated key.
On Debian you may have to delete the key (
apt-key -d) before adding it again.
- During installation I see warnings like these:
chcon: can't apply partial context to unlabeled file
If you have disabled
SELinux you can ignore those warnings, otherwise you may need to relabel your filesystem and ensure that the xpra codecs mentioned in those warnings are labelled correctly to prevent runtime codec failures:
chcon -t texrel_shlib_t CODECFILE
Warning: xpra server does not support initenv
Your server is out of date, upgrade it. This may cause remote ssh start to fail.
- Do I need to have
OpenGLenabled on the client?
No, it is optional but strongly recommended in order to achieve good performance.
No module named gdkgl
Install gtkglext and its Python bindings to enable support for
- How do I enable
OpenGLor other X11 extensions on the server?
No OpenGL_accelerate module loaded"
You can install the required module: OpenGL_accelerate or you can ignore this warning, it only means that some
OpenGL operations will not be fully accelerated. (Note, if you install python-opengl via distro package manager, e.g. apt, you should not install OpenGL_accelerate directly using pip. That would likely install the latest version which may well be incompatible with PyOpenGL installed via package manager. Rather, you should go to OpenGL_accelerate website and download the version that is the same with your python-opengl package and install it manually!)
- I get some
OpenGLrelated warnings/errors at runtime:
ImportError: cannot import name GL Unable to load registered array format handler numeric Unable to load registered array format handler vbo Unable to load registered array format handler vbooffset
These warnings can safely be ignored. It means that your python
OpenGL installation is incomplete, either install the missing modules (usually
python-numeric) or if you are building from source, you can apply the silence-pyopengl-formathandler-warnings.patch patch to silence those warnings.
- I get errors like these:
No module named Numeric No module named numpy
This is the same issue as the one above, same answer.
- Why don't you fix those
OpenGLwarnings/errors? Or silence warnings by default?
Version 0.12 does. Note: this is a packaging issue (see redhat bugzilla, debian bug), and those are not our packages. Silencing warnings by default is bad practice, some of those messages may well be legitimate. The developers/packagers should remove those that are not. Importing a library should not show ugly warnings on screen, especially when the missing libraries it complains about are deprecated and not available for installation. You can see this for yourself with:
python -c 'import logging; logging.basicConfig(); \ logging.root.setLevel(logging.INFO); \ import OpenGL; from OpenGL.GL import GL_VERSION, GL_EXTENSIONS;'
- There is no system tray with Ubuntu.
There is. Just don't use the packages shipped by Ubuntu, which are outdated and lack the necessary dependencies.
- There is no system tray with gnome shell
Please complain to gnome for breaking things, they removed the system tray, see #476. There are extensions you can use to restore the system tray area (topicons is one). With v0.11 onwards, you can still access the session information window using the
- There is no system tray with KDE5
Just like gnome3, KDE decided to break things, see #1016.
- Does Xpra work with Windows, Mac OS X, Android?
Some platforms have known limitations: more limited clipboard support on Windows and Mac OS X, no soft keyboard input on Android, etc. If you find a bug or missing feature, please do let us know.
- I use
Xpra.exebut there is no output
Xpra_cmd.exe to get output in your DOS window,
Xpra.exe redirects all output to its log file
- Some applications crash or do not start at all.
This can either be a bug in xpra or some application configuration issue. For example see #435:
gnome-terminal may need
--disable-factory. Bugs can be fixed, misbehaving applications.. not so much.
- My application menus are missing on Ubuntu
This breakage was caused by Ubuntu's global menus hack, start your applications with
UBUNTU_MENUPROXY set to an empty string to disable this mess (ie:
UBUNTU_MENUPROXY="" yourapplication )
- Does this work with KDE?
Yes. There were problems with some versions of KDE/oxygen (older versions simply crashed, some newer versions prevented clicks from propagating to xpra