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

X.Org X server -- AMD/ATI display driver wrapper (debugging symbols)

 This package provides the 'ati' driver for the AMD/ATI Mach64, Rage128,
 Radeon, FireGL, FireMV, FirePro and FireStream series. This driver is
 actually a wrapper that loads one of the 'mach64', 'r128' or 'radeon'
 sub-drivers depending on the hardware.
 These sub-drivers are brought through package dependencies.
 .
 This package provides debugging symbols for this X.org X driver wrapper
 and brings debugging symbols for sub-drivers through package dependencies.