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It is not a power-saving or screensaver issue, it is literally every 25 seconds that my screen either blacks out or blacks out and locks so i have to put my password in over and over. Please help! (It has locked five times in the typing of this paragraph.)

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Could you please state which version and variant of Ubuntu you are using and what kind of setup you've got? – N.N. Jun 14 '11 at 12:07

Go to System > Preferences > Screensaver

You need to uncheck "Lock screen when screensaver is active"

enter image description here

If this doesn't work , maybe there is an issue with the graphics drivers or something. Also please edit your question mention what version are you using?

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As far as I understood the screen locks, try to open gconf-editor choose desktop, gnome, lockdown and tick the box disable lock screen. If not installed use synaptics to install.

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