Hello
Libre Office came with Fedora I think 20. The Libre Office Version: 5.2.6.2 Build ID: 5.2.6.2-4.fc25.
When I installed Fedora I installed it as living in Australia using a US keyboard.
I selected Language Australia from the list. The spell checker does not work at all. I believe that although the option to select English Australian is available form the tools the dictionary is not installed. It therefore gives the wrong impression that it is spellchecking.
I do not know how to download and install the Australian dictionary.
The spellchecker works fine in English US.
Not a problem with the Windows version.
Thanks for your help and excellent product.