That's not the way I learned in France, where they make you signal left before entering and use the inner lane, only if you're going further than halfway through the roundabout.

You signal right before entering only if you're taking the first exit.

In any case you signal right after driving past the last exit before your own.

Australian rules are (we keep left and go clockwise around roundabouts)

• If turning left, indicate left throughout the entry and exit
• If turning right, indicate right, indicate left after the exit before the one you are using
• If going straight ahead don't indicate on entry, indicate left after the exit before the one you're taking

I'm sure most people follow the rules, but I see a lot who indicate wrong, and the drivers of the various premium brands don't indicate at all ever

in the Netherlands people often do signal left while on the roundabout but that feels mostly because of cyclists who also do so.