Hi, I connected PPPoE connection to router and connected router to PC through LAN cable and can't browse Internet on browser

Support Network
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18

What happens if you run from terminal
systemctl restart NetworkManager

What is showing the command
cat /etc/resolv.conf
and
ip addr

Did you add the system tray back to your panel? Is the network status showing connected and the correct IP?
Your issue seems to be the opposite of this one