Binary package “xserver-xorg-video-nouveau-dbg” in ubuntu xenial

X.Org X server -- Nouveau display driver (debug symbols)

 This driver for the X.Org X server (see xserver-xorg for a further description)
 provides support for NVIDIA Riva, TNT, GeForce, and Quadro cards.
 This package provides 2D support including EXA acceleration, Xv and
 RandR. 3D functionality is provided by the libgl1-mesa-dri package.
 This package provides debugging symbols for this Xorg X driver.