It took me quite some time to get Finnish hyphenation working with LaTeX and babel. I don’t know why current Linux distributions seem to comment out languages, I never had this problem before. But here are the steps to get Finnish hyphenation working:

1. Run texconfig and select hyphenation and latex. In the editor remove the comments from those languages that you want to use (finnish in this case).
2. Run fmtutil --all in the shell
3. Now the generic instructions of appending

   \usepackage[T1]{fontenc}
   \usepackage[latin1]{inputenc}
   \usepackage[finnish]{babel}
   

   to the preamble of the document will work

Thank goodness for Google though…