Ubuntu Mate 20.04 keyboard layout panel indicator missing
After upgrade to 20.04 and resetting the panel settings I can no longer see the keyboard layout indicator on the panel. Not sure about exact steps to reproduce it. I suppose, you can remove the "Indicator Applet Complete" and re-add it to the panel. The layout switching works fine.
Adding screenshot for reference:
Solution 1:
You can solve it using MATE Tweak. You can install MATE tweak using:
$ sudo apt install mate-tweak
Type mate tweak in the search tool bar, go to panel and select a different layout.
It might appear.
MATE tweak → Panel → different layout.