When I found this page

https://doc.sagemath.org/html/en/reference/spkg/_sagemath.html

I immediately thought... "I bet these don't work". The only one I wanted to try was Ubuntu with the latest version, and indeed it didn't work. The instructions are

sudo apt-get install  sagemath sagemath-doc-en sagemath-jupyter

but "sagemath-doc-en" has to be replaced by "sagemath-doc".

I wonder if the top of the page should just say "The package names may change slightly or be deprecated and we do not regularly test them, so please pay attention to the output of your package manager."

I also noticed that the sentence at the bottom seem to be missing a period. Also, the trac link is broken, since it is just https://trac.sagemath.org/27330 instead of https://trac.sagemath.org/ticket/27330. Was that a standard redirect with trac (to not have /ticket" or was it a mistake in this particular link? I have no idea, but if it is common, then I can add new redirects here.