...but I don't know what happened and where to look for a solution.
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sudo mount -o remount,rw /
By chance, I did a backup image of the root USB system (I always have root filesystem on a USB drive) just after the last shut down, two days ago. So I thought: <<that's good, I'll restore the system to another drive and I'll be good to go. Must be this USB drive>> ... Unfortunately not: whatever happened that's booting Raspbian read-only, it happened before taking the snapshot. On the new drive with the restored image it's exactly the same.
Any ideas? I made some searches, but I found nothing ("read-only" "boot" "raspberry pi" returns only stuff where you *want* to
boot RO and this is not my case).