I have downloaded and installed the latest ISO as you suggested. It is much better but still cannot write greek:
All system menus are translated to greek (which is not what I am after) and also the language indication down right is set to ‘GR’… I have checked the keyboard setting, everything seems to be perfect except that it’s not possible to write greek. Whatever I do the keyboard input is always English.
I tried to set up the language manually with ‘sudo apt-get install language…’ commands and everything seems to be already installed correctly. But I have not succeeded. That’s strange because in Ubuntu I didn’t have any difficulties to set up other languages.