Effets visuels nvidia - Ubuntu

hamza@hamza-laptop:~$ nvidia-settings 

ERROR: Cannot open display 'hamza-laptop:0.0'.


ERROR: Unable to assign attribute CursorShadow specified on line 21 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute CursorShadowAlpha specified on line 22 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute CursorShadowRed specified on line 23 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute CursorShadowGreen specified on line 24 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute CursorShadowBlue specified on line 25 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute CursorShadowXOffset specified on line 26 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute CursorShadowYOffset specified on line 27 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute SyncToVBlank specified on line 28 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute LogAniso specified on line 29 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute FSAA specified on line 30 of configuration
       file '/home/hamza/.nvidia-settings-rc' (no Display connection).


ERROR: Unable to assign attribute TextureSharpen specified on line 31 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute AllowFlipping specified on line 32 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute FSAAAppControlled specified on line 33 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute LogAnisoAppControlled specified on line 34 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute OpenGLImageSettings specified on line 35 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute RedBrightness specified on line 36 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute GreenBrightness specified on line 37 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute BlueBrightness specified on line 38 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute RedContrast specified on line 39 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute GreenContrast specified on line 40 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute BlueContrast specified on line 41 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute RedGamma specified on line 42 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute GreenGamma specified on line 43 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute BlueGamma specified on line 44 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute DigitalVibrance specified on line 45 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute ImageSharpening specified on line 46 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute GPUScaling specified on line 47 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute XVideoTextureSyncToVBlank specified on line
       48 of configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute XVideoBlitterSyncToVBlank specified on line
       49 of configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).


ERROR: Unable to assign attribute XVideoSyncToDisplay specified on line 50 of
       configuration file '/home/hamza/.nvidia-settings-rc' (no Display
       connection).

Xlib:  extension "GLX" missing on display ":0.0".