\setmainfont works with XeTeX but not with LuaTeX

Question

I'm trying to use LuaTeX with Adobe's Garamond Premier Pro, but it doesn't work, saying that:

! error:  (type 0): cannot find file ''
!  ==> Fatal error occurred, no output PDF file produced!

while XeTeX compiles fine.

I managed to narrow down the issue to the following code:

\documentclass{article}
\usepackage{fontspec}
\setmainfont{Garamond Premier Pro}
\begin{document}
hello
\end{document}

I'm using TeXLive 2018.

Following Ulrike's suggestion, I changed the font name by the file name:

\documentclass{article}
\usepackage{fontspec}
% \setmainfont{Garamond Premier Pro}
\setmainfont{GaramondPremrPro.otf}
\begin{document}
hello
\end{document}

this didn't work as well :/

So I tried copying GaramondPremrPro.otf from the installed directory ($HOME/.local/share/fonts/) to the current directory, then it worked (it also works if I put them in a directory in the texmf tree). So I guess that the problem is with Ubuntu's font directory...

---

Addendum: Something I think it's odd...

Suppose I have only the file GaramondPremrPro.otf in the current directory and call the font by the file name:

\documentclass{article}
\usepackage{fontspec}
% \setmainfont{Garamond Premier Pro}
\setmainfont{GaramondPremrPro.otf}
\begin{document}
hello
\bfseries
hello
\end{document}

I get a only font substitution warning because LaTeX couldn't find the bold font file:

LaTeX Font Warning: Font shape `TU/GaramondPremrPro.otf(0)/bx/n' undefined
(Font)              using `TU/GaramondPremrPro.otf(0)/m/n' instead on input line 7.

However, if I call the font by its name:

\documentclass{article}
\usepackage{fontspec}
\setmainfont{Garamond Premier Pro}
% \setmainfont{GaramondPremrPro.otf}
\begin{document}
hello
\bfseries
hello
\end{document}

I get the cryptic cannot find file '' from above.

If I remove the \bfseries instruction, both versions work.

Answer 1

It seems that one of the cache files was broken.

After deleting the cache files in

/usr/local/texlive/2018/texmf-var/luatex-cache/generic/names/

and in

/usr/local/texlive/2018/texmf-var/luatex-cache/generic/fonts/otl

and letting luaotfload recreate everything the font could be used.