# GPU not found - NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver **URL:** \ **Category:** CUDA Setup and Installation\ **Tags:** omniverse\_extension\ **Created:** [October 7, 2021, 7:51pm UTC](https://forums.developer.nvidia.com/t/gpu-not-found-nvidia-smi-has-failed-because-it-couldnt-communicate-with-the-nvidia-driver/191536 "2021-10-07T19:51:04Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![omar.qusous](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@omar.qusous](https://forums.developer.nvidia.com/u/omar.qusous)\ **Post date:** [October 7, 2021, 7:51pm UTC](https://forums.developer.nvidia.com/t/gpu-not-found-nvidia-smi-has-failed-because-it-couldnt-communicate-with-the-nvidia-driver/191536/1 "2021-10-07T19:51:04Z")
My GPU was working fine and suddenly the following happened. This happened twice where I have had to terminate my virtual machines and re-install cuda/python environment. I would install cuda, check `nvidia-smi`, `cat /proc/driver/nvidia/version` and `nvcc --version` returning the expected outputs. Now, without prior warning: The results of the checking nvidia: 1. `nvidia-smi` gives: ```auto NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running. ``` 1. `cat /proc/driver/nvidia/version` gives: ```auto cat: /proc/driver/nvidia/version: No such file or directory ``` 1. `nvcc --version` gives: ```auto Copyright (c) 2005-2020 NVIDIA Corporation Built on Thu_Jun_11_22:26:38_PDT_2020 Cuda compilation tools, release 11.0, V11.0.194 Build cuda_11.0_bu.TC445_37.28540450_0 ``` Other information that might be helpful. `dpkg -l | grep nvidia` ii libnvidia-cfg1-450:amd64 450.51.05-0ubuntu1 amd64 NVIDIA binary OpenGL/GLX configuration library ii libnvidia-common-450 450.51.05-0ubuntu1 all Shared files used by the NVIDIA libraries ii libnvidia-compute-418:amd64 430.50-0ubuntu3 amd64 Transitional package for libnvidia-compute-430 ii libnvidia-compute-430:amd64 440.100-0ubuntu0.20.04.1 amd64 Transitional package for libnvidia-compute-440 ii libnvidia-compute-440:amd64 450.119.03-0ubuntu0.20.04.1 amd64 Transitional package for libnvidia-compute-450 ii libnvidia-compute-450:amd64 450.51.05-0ubuntu1 amd64 NVIDIA libcompute package rc libnvidia-compute-450-server:amd64 450.142.00-0ubuntu0.20.04.1 amd64 NVIDIA libcompute package ii libnvidia-decode-450:amd64 450.51.05-0ubuntu1 amd64 NVIDIA Video Decoding runtime libraries ii libnvidia-encode-450:amd64 450.51.05-0ubuntu1 amd64 NVENC Video Encoding runtime library ii libnvidia-extra-450:amd64 450.51.05-0ubuntu1 amd64 Extra libraries for the NVIDIA driver ii libnvidia-fbc1-450:amd64 450.51.05-0ubuntu1 amd64 NVIDIA OpenGL-based Framebuffer Capture runtime library ii libnvidia-gl-450:amd64 450.51.05-0ubuntu1 amd64 NVIDIA OpenGL/GLX/EGL/GLES GLVND libraries and Vulkan ICD ii libnvidia-ifr1-450:amd64 450.51.05-0ubuntu1 amd64 NVIDIA OpenGL-based Inband Frame Readback runtime library ii nvidia-compute-utils-450 450.51.05-0ubuntu1 amd64 NVIDIA compute utilities ii nvidia-dkms-450 450.51.05-0ubuntu1 amd64 NVIDIA DKMS package ii nvidia-driver-450 450.51.05-0ubuntu1 amd64 NVIDIA driver metapackage ii nvidia-kernel-common-450 450.51.05-0ubuntu1 amd64 Shared files used with the kernel module ii nvidia-kernel-source-450 450.51.05-0ubuntu1 amd64 NVIDIA kernel source package ii nvidia-modprobe 450.51.05-0ubuntu1 amd64 Load the NVIDIA kernel driver and create device files ii nvidia-prime 0.8.16~0.20.04.1 all Tools to enable NVIDIA’s Prime ii nvidia-settings 450.51.05-0ubuntu1 amd64 Tool for configuring the NVIDIA graphics driver ii nvidia-utils-450 450.51.05-0ubuntu1 amd64 NVIDIA driver support binaries ii screen-resolution-extra 0.18build1 all Extension for the nvidia-settings control panel ii xserver-xorg-video-nvidia-450 450.51.05-0ubuntu1 amd64 NVIDIA binary Xorg driver lspci | grep -i nvidia 00:1e.0 3D controller: NVIDIA Corporation TU104GL [Tesla T4] (rev a1) ---
**Author:** ![omar.qusous](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@omar.qusous](https://forums.developer.nvidia.com/u/omar.qusous)\ **Post date:** [October 7, 2021, 9:04pm UTC](https://forums.developer.nvidia.com/t/gpu-not-found-nvidia-smi-has-failed-because-it-couldnt-communicate-with-the-nvidia-driver/191536/2 "2021-10-07T21:04:03Z")
`nvidia-settings` gives: `ERROR: NVIDIA driver is not loaded` `dkms status` gives: `nvidia, 450.51.05, 5.4.0-1045-aws, x86_64: installed` ---
**Author:** ![AKravets](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/akravets/32/9748_2.png) [@AKravets](https://forums.developer.nvidia.com/u/AKravets)\ **Post date:** [October 8, 2021, 7:54am UTC](https://forums.developer.nvidia.com/t/gpu-not-found-nvidia-smi-has-failed-because-it-couldnt-communicate-with-the-nvidia-driver/191536/3 "2021-10-08T07:54:42Z")
Hi @omar.qusous, This forum branch is dedicated to CUDA-GDB tool support. Your question might be more suitable for [CUDA Setup and Installation - NVIDIA Developer Forums](https://forums.developer.nvidia.com/c/accelerated-computing/cuda/cuda-setup-and-installation/8) forum branch. I have moved your topic there.