Hi Ciro,

> I type:
> sudo mtxrun -script fonts --list
> 
> and I get:
> sudo: unable to execute /usr/bin/mtxrun: No such file or directory
Considering that mtxrun exist, I suspect the interpreter of the script does
not exist, which is texlua on my system:

  $ head -1 /usr/bin/mtxrun 
  #!/usr/bin/texlua

So the mtxrun script should be run by texlua, which is again a symlink to
luatex:

  $ ls -l /usr/bin/texlua
  lrwxrwxrwx 1 root root 6 2009-05-07 11:26 /usr/bin/texlua -> luatex

Perhaps you don't have luatex installed, or you are missing this symlink?

Gr.

Matthijs