Cannot produce PDF using Ubuntu 18.04 and RStudio

I am using

  • RStudio Version 1.2.5033,
  • R version 3.6.2 (2019-12-12),
  • package ‘rmarkdown’ version 2.1,
  • package ‘tinytex’ version 0.20.

during the render process I am getting this error:

TeX Live 2019 is frozen forever and will no
longer be updated.  This happens in preparation for a new release.

If you're interested in helping to pretest the new release (when
pretests are available), please read https://tug.org/texlive/pretest.html.
Otherwise, just wait, and the new release will be ready in due time.
TeX Live 2019 is frozen forever and will no
longer be updated.  This happens in preparation for a new release.

If you're interested in helping to pretest the new release (when
pretests are available), please read https://tug.org/texlive/pretest.html.
Otherwise, just wait, and the new release will be ready in due time.
tlmgr: package repository http://ctan.mirrors.hoobly.com/systems/texlive/tlnet (verified)
[1/1, ??:??/??:??] install: multirow [3k]
running mktexlsr ...
done running mktexlsr.
tlmgr: package log updated: /home/mcc/.TinyTeX/texmf-var/web2c/tlmgr.log

I have deleted /usr/local/texlive2019 and then reinstalled tinytex several times with no luck. I have tried to install texlive as the error suggested and am having difficulty calling a remote server.

I would appreciate some help.

Part of the Issue was helped by this comment on S.O.:

Could you try to remotes::install_github('yihui/tinytex') , restart R, tinytex::reinstall_tinytex() , and try to compile your document to PDF again? – Yihui Xie

Yes, this does help but I believe I have another error to diagnose.

Error: Functions that produce HTML output found in document targeting latex output.
Please change the output type of this document to HTML. Alternatively, you can allow
HTML output in non-HTML formats by adding this option to the YAML front-matter of
your rmarkdown file:

  always_allow_html: true

Note however that the HTML output will not be visible in non-HTML formats.

In addition: Warning message:
Setting row names on a tibble is deprecated. 
Please delete _main.Rmd after you finish debugging the error.

So I added:

output:
  bookdown::pdf_book:
    always_allow_html: true

to index.rmd. But this is not helping.
Any Ideas

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