Nouveau

  ERROR: The Nouveau kernel driver is currently in use by your system.  This driver is incompatible with the NVIDIA driver, and must be disabled before
  proceeding.  Please consult the NVIDIA driver README and your Linux distribution’s documentation for details on how to correctly disable the Nouveau
  kernel driver.

 ERROR: An NVIDIA kernel module ‘nvidia’ appears to already be loaded in your kernel.  This may be because it is in use (for example, by an X server, a CUDA
  program, or the NVIDIA Persistence Daemon), but this may also happen if your kernel was configured without support for module unloading.  Please be
  sure to exit any programs that may be using the GPU(s) before attempting to upgrade your driver.  If no GPU-based programs are running, you know that
  your kernel supports module unloading, and you still receive this message, then an error may have occured that has corrupted an NVIDIA kernel module’s
  usage count, for which the simplest remedy is to reboot your computer.

 ERROR: Installation has failed.  Please see the file ‘/var/log/nvidia-installer.log’ for details.  You may find suggestions on fixing installation problems
  in the README available on the Linux driver download page at www.nvidia.com.

ERROR: Unable to load the kernel module ‘nvidia.ko’.  This happens most frequently when this kernel module was built against the wrong or improperly
         configured kernel sources, with a version of gcc that differs from the one used to build the target kernel, or if another driver, such as nouveau, is
   present and prevents the NVIDIA kernel module from obtaining ownership of the NVIDIA GPU(s), or no NVIDIA GPU installed in this system is supported by
   this NVIDIA Linux graphics driver release.

   Please see the log entries ‘Kernel module load error’ and ‘Kernel messages’ at the end of the file ‘/var/log/nvidia-installer.log’ for more
         information.

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