https://streamlink.github.io/install.html#linux-and-bsd

Ubuntu	Not recommended. Ubuntu inherits the streamlink package from Debian, but doesn't maintain or update it. See Package availability.

https://streamlink.github.io/install.html#package-availability

Packaging is not done by the Streamlink maintainers themselves except for the PyPI package, the Windows installers + portable builds, and the Linux AppImages.

Users of glibc-based Linux distros can find up-to-date Streamlink releases via the available AppImages.

https://streamlink.github.io/install.html#pypi-package-and-source-code