Thanks you all, for good advice.
As for now it seems to be solved. Comments on the thread had also pointed me towards dns questions.I don't recall configuring more than hostname during installation, but when I first started the distro it connected to the internet apparently "magically" as it had done under installation and so I never bothered before I discovered there was a large number of sites that returned the error:
Quote:
Hmm. We’re having trouble finding that site.
We can’t connect to the server at guce.yahoo.com.
If you entered the right address, you can:
Try again later
Check your network connection
Check that Firefox has permission to access the web (you might be connected but behind a firewall)
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Since it still did connect too many other sites, apparently without any consistent pattern, it never occurred to me (inexperienced as I am) that it could be a configuration problem.
When they first tipped me I connected to a wired connection, run Nmtui, configured the wired connection manually and got a normal conection.
So this solved.
always grateful !
Edit: Of course, I unfortunately still cannot understand the logic underlying the "Choice" of which sites got connected and which did not :-(