It is repo error that not found maybe try sudo apt-get update.

If you are successful you will need to add it to init scripts for clusters.

Additionally command on https://gstreamer.freedesktop.org/documentation/installing/on-linux.html?gi-language=c is a bit longer than on Microsoft page:

apt-get install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgstreamer-plugins-bad1.0-dev gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-doc gstreamer1.0-tools gstreamer1.0-x gstreamer1.0-alsa gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5 gstreamer1.0-pulseaudio