No password required in Xubuntu after waking up

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http://askubuntu.com – I just can't fix it. It seems like Xubuntu does not need to ask for a password everytime I manage to wake up the laptop, pulling the lid over. I Googled a lot trying to solve the problem. And already tried following both of the steps over here -> Xubuntu: No password request after suspension But no success. Thank you so much in advance. (HowTos)