36.434 people didn’t vote in the 2017 municipal elections even though voting is compulsory for all those registered on the electoral roll.
This number includes people that have a valid excuse or that have a dispensation. For example, people over 75 years no longer have to fulfill their elective duty.
For more information, check the article on Tageblatt’s website (in german).
The official portal of the Grand Duchy of Luxembourg has more general information on local elections.