messed up network manager.

[Jim]

I made the mistake of installing pihole on this machine which is running 
kubuntu 20.04.  When it finished, DNS didn't work anymore.  I 
uninstalled piehole.  Somehow I messed up network manager.  It doesn't 
show that I have a network connection.  I could ping IP addresses such 
as 8.8.8.8 but DNS still didn't work.  I edited 
/etc/systemd/resolved.conf where I added DNS=8.8.8.8 and 
FallbackDNS=8.8.4.4.  I rebooted and DNS is working again.  Still, 
Network Manager is messed up.  I click on it and it doesn't show any 
available networks.  I can right click on the network manager icon, then 
click Configure network connections, and the ethernet connection is 
there. The option in Network manager to stop or start the network isn't 
there.

Please somebody tell me how to fix this.

Thanks.