I assume that you are using network manager (NM) - you do not say.
If yes:
  * what is in your /etc/resolv.conf?
  * If you see something else than your router just delete the file as root and
reconnect to the network using NM - it will recreate new /etc/resolv.conf

Hopefully, things will work as normal after that.

Tomas

On Sat, 2020-02-22 at 20:17 -0800, John Jason Jordan wrote:
> My laptop computer can access the lan, but not the internet. My desktop
> computer (on which I am writing this) still connects fine. On either
> computer I can log into the router, and everything looks OK, except
> that I have no idea what to look for.
> 
> I have tried every command I can think of, and no luck. The killer was
> when I finally gave up trying to fix the laptop and just rebooted it -
> only to discover that it still cannot reach the internet. Now I'm in
> deep doodoo.
> 
> I must also add that just before this happened I disconnected the VPN
> (Private Internet Access). Obviously I closed the app and even used top
> to kill it completely, but no luck, I would uninstall it even except
> that it was installed with a ,run script and I don't know how to
> uninstall it. Nevertheless, it is pretty damning evidence that somehow
> the VPN messed me up.
> 
> I'm dead in the water here. Any suggestions welcome!
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