'Installing RTSP Server Python bindings on Linux

I am trying to install Python bindings of RTSP Server on my Linux camera. I have working Gstreamer, opencv. When I try installing the below, I get the following error.

apt get-update
apt install gir1.2-gst-rtsp-server-1.0
Error : Temporary failure resolving 'ports.ubuntu.com'

I am fairly newto linux. Any help in explaining how to install RTSP Server on Linux will be greatly appreciated.

Thanks already



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