Ones I’ve personally heard:
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parking (either insuficient or too tight)
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speed of service in restaurants
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“why don’t they speak english?!”
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accessibility for the disabled (this one is actually pretty fair, but it’s also very hard to fix)
Edit, PS: the lack of public toilets is also a fair complaint. It’s also a pretty common one, even in New York and London. Amsterdam comes to mind as a decent counter-example, at least for men. There are urinals strewn about most everywhere in the city.
Not a horrible place to be stuck, though. Pop!_OS is pretty great. I run it on my media server and it’s been rock solid. I definitely wouldn’t mind running it on an old laptop.