[winswitch] error on starting xpra

Antony Lee antony.lee at berkeley.edu
Thu Sep 10 07:35:56 BST 2015

I am trying to run xpra for the first time.

$ xpra start ssh:antony at maxwell:100 --start-child xterm

This fails with the following message:

2015-09-09 23:36:56,493 cannot use pycups for printing: No module named cups
2015-09-09 23:36:56,513 unknown logging category: x265
2015-09-09 23:36:56,543  cannot import csc_opencl (OpenCL colorspace
conversion): No module named pyopencl
2015-09-09 23:36:56,564 Warning: zlib is the only compressor enabled
2015-09-09 23:36:56,564  install and enable lzo or lz4 support for better
2015-09-09 23:36:56,565 xpra gtk2 client version 0.15.5 (r10506)
2015-09-09 23:36:56,566 csc module csc_opencl could not be loaded: No
module named pyopencl
2015-09-09 23:36:56,567 OpenGL support could not be enabled:
2015-09-09 23:36:56,567  cannot import name gdkgl
2015-09-09 23:36:56,697 detected keyboard: rules=evdev, model=pc101,
2015-09-09 23:36:56,698 desktop size is 1600x900 with 1 screen(s):
2015-09-09 23:36:56,699   ':0.0' (423x238 mm - DPI: 96x96) workarea:
2015-09-09 23:36:56,699     eDP1 (309x174 mm - DPI: 131x131)
Entering daemon mode; any further errors will be reported to:
server failed to start after 15.0 seconds - sorry!
2015-09-09 23:37:13,242 failed to receive anything, not an xpra server?
2015-09-09 23:37:13,242   could also be the wrong username, password or port
2015-09-09 23:37:13,242 Connection lost

On the server side, the log is as follows:

Fatal server error:
(EE) The '-logfile' option cannot be used with elevated privileges.
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
2015-09-09 23:33:47,743 failed to load the mdns avahi publisher: No module
named dbus
2015-09-09 23:33:47,743 either fix your installation or use the '--no-mdns'
2015-09-09 23:33:47,743
2015-09-09 23:33:47,743 Xvfb command has terminated! xpra cannot continue
2015-09-09 23:33:47,743
2015-09-09 23:33:47,744 removing socket /home/antony/.xpra/maxwell-arch-100

Both sides use the AUR xpra-winswitch package (

Any help would be welcome.


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