As stated in the opening comment, I eddited /etc/texmf/web2c/fmtutil.cnf. I did this because I found these lines: # from latex-bin: latex pdftex language.dat -translate-file=cp227.tcx *latex.ini pdflatex pdftex language.dat -translate-file=cp227.tcx *pdflatex.ini dvilualatex luatex language.dat,language.dat.lua dvilualatex.ini lualatex luatex language.dat,language.dat.lua lualatex.ini luajitlatex luajittex language.dat,language.dat.lua lualatex.ini The last three mention luatex as second word. Well actually the last line does not... But in the opening comment I refer to three lines and not two. Anyway, I took a leap of faith and changed those into: dvilualatex lualatex language.dat,language.dat.lua dvilualatex.ini lualatex lualatex language.dat,language.dat.lua lualatex.ini luajitlatex luajitlatex language.dat,language.dat.lua lualatex.ini Well, again, there's really only two lines: dvilualatex and lualatex. After running 'fmtutil --byfmt lualatex.fmt' as root and thereby regenerating what ever needs to regenerated, the lualatex command no-longer failed. That was my solution and I could continue. Actually, I was using beamer to create a presentation, but that is besides the point. Given your solution to a fix, I though it would be best to revert the changes I made to the /etc/texmf/web2c/fmtutil.cnf file and rerun the fmutil command as root again. Doing so caused the lualatex command to fail as it originally did. So, that gave me a reasonable starting point to test your suggestion. It only seemed fair to me to go back to the original state. After applying your solution, the lualatex finished without error as well. I just tested a quick and simple TeX document and that seems to run just fine. Running luatex yields in a readable pdf. To be clear this is your suggested fix. Hope this helps, Gerben