Differences between libertine and libertinus packages regarding pdfTeX

Question

Until now I did not switch to LuaTeX and prefer pdfTeX, because it's faster. Since some years I've been using the old libertine-legacy package, e.g. because I need the command \libertingeGlyphand \biolinumGlyph, which print a certain glyph.

On the long run I'll have to dismiss libertine-legacy and replace it either with libertine or the fork libertinus.

Can somebody point out differences between these two packages with regard to pdfTeX, which I'm using?

And how I can use e.g. roman numbering without the \libertineGlyphcommand, which used to provide the roman numbering glyphs from libertine in an example like this:

\documentclass{scrartcl}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{libertine}

\begin{document}

I'd like to use a Roman Number, but how to do without \libertineGlyph{Oneroman}

\end{document}

Or how can I define the two mentioned commands, either with libertine or libertinus-package?

Answer 1

Can somebody point out differences between these two packages with regard to pdfTeX

libertinus (and libertinus-otf) will not work with pdf(la)tex. Use libertine (or libertine-legacy) or use xelatex (or lualatex) with libertinus and libertinus-otf.

Answer 2

You mention lua(la)tex but not xe(la)tex. Using the libertine package with xelatex, the \libertineGlyph and \biolinumGlyph commands should be available.