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NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver-ubuntu server

cd flag

Hi guys I am trying to install the Nvidia graphics card on an ubuntu server. after running two commands on the ubuntu server: sudo add-apt-repository ppa:graphics-drivers/ppa and sudo apt install nvidia-driver-460 which gets installed successfully. but when I check if it is installed or not it shows me an error :

root@ip-123-12-12-12:/home/ubuntu# nvidia-smi
NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.
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id flag
Have you rebooted your system since you installed the driver? Also, have you disabled Secure Boot in your BIOS?
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