What do I have to do to switch from writing in one language (such as English) to another (such as French) on Lubuntu 18.04.1 LTS? I use French and I need to use Arabic.
As for myself, I have to switch between French, English and Russian. I installed all 3 Input sources in Settings/Region & language. I recently discovered I had to press Super Key+Shift+Space to switch keyboard setting.
When there are only 2 input sources, just press Super Key + Space.