The most popular system language for an operating system is English when working as a system developer, but when it comes to writing document you probably need a local language spelling package. And in me previous blog I have written how to install swedish spelling package for LibreOffice, but with Ubuntu 12.10 there is a better way. Install the spelling checking package as debian package.
Afer installation you need to restart LibreOffice. Then you need to make LibreOffice aware of the the new spelling package. You do that by open Tools -> Options... -> Language Settings -> Writing Aids
Now you can change spelling checking for text or the complete document via Tools -> Language