Install cuDNN and TensorRT

sudo apt install tensorrt-dev

Set the TensorRT environment variables system-wide via /etc/profile.d/tensorrt.sh:

sudo tee /etc/profile.d/tensorrt.sh << 'EOF'
# Runtime path — required to run TensorRT command-line tools
export PATH=/usr/src/tensorrt/bin${PATH:+:$PATH}
EOF

Re-login or run source /etc/profile.d/tensorrt.sh to apply immediately.