xv port not available

[Tatiana Sula]

Hello,
I was wondering if I installed all the gstreamer plugins I need and I found
this site:

https://gstreamer.freedesktop.org/documentation/frequently-asked-questions/using.html

There is a particular command that checks if video output gets displayed.
With ximagesink I get the output  I expect while xvimagesink displays this
message :

gst-launch-1.0 videotestsrc ! videoconvert ! xvimagesink
Setting pipeline to PAUSED ...
ERROR: Pipeline doesn't want to pause.
ERROR: from element /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0:
Could not initialise Xv output
Additional debug info:
xvimagesink.c(1760): gst_xv_image_sink_open ():
/GstPipeline:pipeline0/GstXvImageSink:xvimagesink0:
No Xv Port available
Setting pipeline to NULL ...
Freeing pipeline ...


I'm using Ubuntu 16.04 inside a virtual machine. How should I solve this
problem?

Thank you
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