after searching a little bit more I found a solution. I went to my home
and renamed fontList.cache to fontList.cache.backup (it would be the same as
if i deleted it, but I wanted a backup just if I had any other problems).
After that I tryed to run my script again and the Times New Roman font was
I've installed the package of true types fonts of microsoft too. In my ubuntu
it was ttf-mscorefonts-installer. Don't know if this is really necessary.
Apparently, what I read about this problem relates this issue with some sort
of problem in atualization of fontList.cache file