Greek spellcheck does not work

When I go to LO → Tools/Options/Language Settings/Languages, at “default languages for documents”. Next to the Greek label I do not see the blue letters “ABC”. How do I add them?

I went to Ubuntu → System Settings/Language support. ΈRemoved and added back the Greek language. Then the system did download some libreoffice greek packages. Still the greek spelcheck did not work…!

I am using ubuntu 16.04.

Can you please help fix this?