I have noticed in most of the websites I have gone to, Firefox is able to display all of them. But in some, it cannot and displays clear boxes with numbers in them and black diamonds with clear question marks in them, instead.

Here are some examples.
http://music.ibiblio.org/pub/multime...aditional.html

and
http://en.wikipedia.org/wiki/He_(letter)

It seems to be related to language packs. I know how to install them in Windows XP, but in Ubuntu, I do not know how to do this.
Could someoe teach me how to, please?

Thank you for your time.

Take care,
RedStarYellowSun