We are using Lua 5.3
Check for file /usr/local/texlive/2021/texmf-var/luatex-cache/generic/names/luaotfload-names
 1.      LibertinusKeyboard-Regular.otf      libertinuskeyboard  /usr/local/texlive/2021/te...Regular.otf
 2.          LibertinusMath-Regular.otf          libertinusmath  /usr/local/texlive/2021/te...Regular.otf
 3.          LibertinusMono-Regular.otf          libertinusmono  /usr/local/texlive/2021/te...Regular.otf
 4.             LibertinusSans-Bold.otf          libertinussans  /usr/local/texlive/2021/te...ns-Bold.otf
 5.           LibertinusSans-Italic.otf          libertinussans  /usr/local/texlive/2021/te...-Italic.otf
 6.          LibertinusSans-Regular.otf          libertinussans  /usr/local/texlive/2021/te...Regular.otf
 7.            LibertinusSerif-Bold.otf         libertinusserif  /usr/local/texlive/2021/te...if-Bold.otf
 8.      LibertinusSerif-BoldItalic.otf         libertinusserif  /usr/local/texlive/2021/te...dItalic.otf
 9.          LibertinusSerif-Italic.otf         libertinusserif  /usr/local/texlive/2021/te...-Italic.otf
10.         LibertinusSerif-Regular.otf         libertinusserif  /usr/local/texlive/2021/te...Regular.otf
11.        LibertinusSerif-Semibold.otf         libertinusserif  /usr/local/texlive/2021/te...emibold.otf
12.  LibertinusSerif-SemiboldItalic.otf         libertinusserif  /usr/local/texlive/2021/te...dItalic.otf
13.  LibertinusSerifDisplay-Regular.otf  libertinusserifdisplay  /usr/local/texlive/2021/te...Regular.otf
14. LibertinusSerifInitials-Regular.otf libertinusserifinitials  /usr/local/texlive/2021/te...Regular.otf
