[ubuntu] vmware user agent fails to start

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http://ubuntuforums.org – I have ubuntu running as a guest in vmware player. I have installed the vmware tools, and everything was going smoothly. I was able to copy paste texts between host & guest. But yesterday I tried with lubuntu and played around a bit with display managers. But suddenly copy pasting texts between host and guest is not working. I have re-installed vmware tools. And vmware user agent is added in the startup applications. While having a close look I see the process /usr/bin/vmware-user is not running at all. When I start it manually I get the command prompt immediately, no errors and nothing ru (Hardware)