i think this bug is also related with nouveau driver.
if i install nvdia proprietary driver the bug does not occur
** Also affects: xserver-xorg-video-nouveau (Ubuntu)
Importance: Undecided
Status: New
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which is subscribed to xserver-xorg-video-nouveau in Ubuntu.
https://bugs.launchpad.net/bugs/2048797
Title:
Screen Sharing no longer works with nouveau driver
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