texlive 2020 pdflatex waits for something

[Richard J. Mathar]

rjm> # to https://tug.org/mailman/listinfo/tex-live
rjm> I have installed texlive 2020 with install-tl and
rjm> TEXHOME=~/texlive/2020 
rjm> 
rjm> printenv | fgrep TEX
rjm> TEXMFHOME=/home/mathar/texlive/2020
rjm> 
rjm> and I am running pdflatex on the following file:
rjm> 

Just ignore that message. There was the very backslash missing
in my final \end{document} line ... a classical syntax error....

The example showed 12 pages of output (for 6 parts) because
by default the book style starts each part on a new double 
page... nothing to worry about and expected.

The LaTex2e <2017-04-15> may appear through some standard openSUSE
latex packages that are already installed (which is 2017), and
which I bypassed by putting the texlive/2020/bin.... in front
of everything of my PATH. Apparently I have to de-install also
the openSUSE 15.2 packages to avoid any interference.