I have made the stupid mistake of changing a file and not saving a copy of its previous version. O changed the uri inside of /usr/lib/NetworkManager/conf.d/20-connectivity-ubuntu.conf
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What's the default value?
This is what I show in my local version of the file on two 20.04 LTS systems:
[connectivity]
uri=http://connectivity-check.ubuntu.com/
Always have backups ...