[DeepStream5.1] ERROR: No EGL Display

There is no update from you for a period, assuming this is not an issue anymore.
Hence we are closing this topic. If need further support, please open a new one. Thanks

I’m not sure if you have fully installed Jetpack, are you able to run deepstream-test1-app normally?

You can try the solution of this topic

If it does not work, it is recommended to reinstall and burn Jetpack and reinstall DeepStream.

https://docs.nvidia.com/metropolis/deepstream/6.0/dev-guide/text/DS_Quickstart.html#install-latest-nvidia-bsp-packages