How to install a LibreOffice Language Tools (Spelling Check, Thesaurus...)

This is apparently managed at the system level. Go to the Language Support menu in the System Settings menu and add the languages you want to support. After that restart LibreOffice and you will see that the spellchecker for example will give you the option of using the newly installed languages.

The command: sudo apt-get install aspell-<language pack> will do the trick

For example, the spanish dictionary is:

sudo apt-get install aspell-es The command: sudo apt-get install aspell-<language pack> will do the trick

For example, the spanish dictionary is:

sudo apt-get install aspell-es

In Kubuntu the package is called myspell-es