Installation texlive-fonts-extra should take care of it.
You can also (though probably not recommend it) say R so you don't use inconsolata. Just change:
\DeclareOption{inconsolata}{\setboolean{ Rd@use @inconsolata}{true}}
to
\DeclareOption{inconsolata}{\setboolean{ Rd@use @inconsolata}{false}}
in your Rd.sty file. When I install it:
/usr/share/R/share/texmf/tex/latex/Rd.sty
but a
locate Rd.sty
must find it on any system.
source share