spellchecker not working in Libre Office Writter-Kubuntu 18.04

I use :

Build ID: 1:6.0.3-0ubuntu1
CPU threads: 4; OS: Linux 4.15; UI render: default; VCL: kde4;
Locale: el-GR (en_US.UTF-8); Calc: group

my system is :
Kubuntu 18.04

my system settings is

the spell checker dont work …neither for Greek nor for English

I need spell check more for my local language (Greek) and second for the other language the English .

Can anyone help me with this problem ?