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When running lspci | grep -i nvidia to check for a GPU, you see “bash: lspci: command not found.” This means the lspci tool itself isn't installed on the system — it's not a sign of a GPU problem.

# CentOS 7.9
sudo yum install pciutils

On Rocky/Ubuntu, just swap yum for the corresponding package manager (Rocky: sudo dnf install -y pciutils; Ubuntu: sudo apt install -y pciutils). Once installed, run lspci | grep -i nvidia again.