install the package http://launchpadlibrarian.net/262502497/xserver-xorg-core-lts-vivid_1.17.1-0ubuntu3.1~trusty1.1_amd64.deb and tested again, this issue has gone.
install the package http:// launchpadlibrar ian.net/ 262502497/ xserver- xorg-core- lts-vivid_ 1.17.1- 0ubuntu3. 1~trusty1. 1_amd64. deb and tested again, this issue has gone.