Avoid screenlock and login screen

Support & Help Requests Raspberry Pi
#1

I have installed Ubuntu-mate 14.04 in Raspberry pi 2B model.I am playing some media contents through python scripts.I have installed light-locker and made changes to avoid screen saver as well.But again after 15 minutes screen is locking and asking to login.

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Could you suggest any way to avoid it .

#2

System -> Preferences -> Hardware -> Power Management

#3

I have done all the necessary settings but this seems to be not affecting.I made the above setting to “NEVER”.