Until they run into one of the many problems that force them to know it. Hell, just googling for "How do I do X in Ubuntu" leads to 20 different random forum threads (because Ubuntu doesn't have any official answer or support for you), with solutions that don't work, because it's random people posting random comments of "what worked for them" over 15 years.
I'm an expert and I can't even figure it out half the time. Regular users are screwed.
Until they run into one of the many problems that force them to know it. Hell, just googling for "How do I do X in Ubuntu" leads to 20 different random forum threads (because Ubuntu doesn't have any official answer or support for you), with solutions that don't work, because it's random people posting random comments of "what worked for them" over 15 years.
I'm an expert and I can't even figure it out half the time. Regular users are screwed.