My first attempt to install GStreamer on Ubuntu 21.04 looks like this:
user@localhost:~$ sudo apt install gstreamer
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package gstreamer
Because that didn't work, therefor I visited the GStreamer webpage for installation on Linux: https://gstreamer.freedesktop.org/documentation/installing/on-linux.html?gi-language=c. As instructed on the aforementioned webpage, my second attempt at GStreamer installation looks like this:
user@localhost:~$ sudo apt-get install libgstreamer1.0-0 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
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package gstreamer1.0-doc is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'gstreamer1.0-doc' has no installation candidate
What procedure enables the installation of GStreamer on Ubuntu 21.04?
You are trying to use partial name of source code package.
Please visit relevant search results on packages.ubuntu.com and choose correct binary package names which suite your needs.
If you know the name of relevant pkg-config/pkgconfig configuration file, then you can use file-search on the same site.
The following installation commands look reasonable: