On Ubuntu 16.04 with the default texlive install, the pdf documentation 
fails to build:
./sage -docbuild reference/algebras pdf
results in

(/usr/share/texlive/texmf-dist/tex/latex/jknapltx/mathrsfs.sty)

! LaTeX Error: File `iftex.sty' not found.

On the same machine, the pdf build is OK for Sage 7.6. I could trace the 
issue back to 8.0.beta9.

This seems to be due to a change in Sphinx:
https://github.com/sphinx-doc/sphinx/issues/2639
Installing the Ubuntu package texlive-generic-extra fixes it. 

Eric.



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