r-cran-bookdown 0.28+dfsg-1 (amd64 binary) in ubuntu lunar

 The bookdown package is a GNU R package that facilitates writing books
 and long-form articles/reports with R Markdown. Features include:
 .
  * Generate printer-ready books and ebooks from R Markdown documents.
  * A markup language easier to learn than LaTeX, and to write elements
    such as section headers, lists, quotes, figures, tables, and
    citations.
  * Multiple choices of output formats: PDF, LaTeX, HTML, EPUB, and Word.
  * Possibility of including dynamic graphics and interactive
    applications (HTML widgets and Shiny apps).
  * Support a wide range of languages: R, C/C++, Python, Fortran, Julia,
    Shell scripts, and SQL, etc.
  * LaTeX equations, theorems, and proofs work for all output formats.
  * Can be published to GitHub, bookdown.org, and any web servers.
  * Integrated with the RStudio IDE.
  * One-click publishing to https://bookdown.org.