I FEEL REALLY STUPID!
I just discovered that the Wired connection DOES work – the cable was just not plugged into the router! (It must have slipped off some time in the past, the plug doesn't lock...)
However, the wifi/ethernet connection still doesn't work – the laptop does not connect. The connection is labeled with the lock icon, although it is open/password-free (what my smartphone calls "Enhanced Open"). When I create a wifi hotspot with my phone, the laptop connects to it and has proper internet. So what's happening with the regular WLAN?
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