In windows I use Pencil software to write in Sinhala. But in Ubuntu I couldn't find a proper software or tool to write in Sinhala. I think the os itself has a method to write in wijesekara layout but I prefer phonetic keyboard layout. Thanks
Ubuntu 18.04
I use the only comes with the OS. Yes it is bit different but when you get used to it, It is much better. But faced some troubles writing 'pra' sinhala word. Again this thing have a character map.