shutdown very freezing at winbind daemon

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http://askubuntu.com – I am using Ubuntu 12.04. From few days my system not shutting down and i thought updates could solve it and waited for updates,got them installed successfully. But still problem exists.good news is I have the reason and bad news is I am not getting how to solve this issue. Ok, here it is. This is the last log message when I am doing shutting down my PC. * stopping the winbind daemon Winbind /speech (HowTos)