I have also the same problem.
Also in gnome-control-center it shows no internet connection in online accounts.
This problem only occurs when network used for internet connection is not managed by NetworkManager.
There is no problem if I use connection that is managed by NetworkManager (wlp3s0 in my case).
$ LANG= nmcli dev status
DEVICE TYPE STATE CONNECTION
wlp3s0 wifi unavailable --
enp0s31f6 ethernet unmanaged --
lo loopback unmanaged --
...
I have also the same problem. center it shows no internet connection in online accounts.
Also in gnome-control-
This problem only occurs when network used for internet connection is not managed by NetworkManager.
There is no problem if I use connection that is managed by NetworkManager (wlp3s0 in my case).
$ LANG= nmcli dev status
DEVICE TYPE STATE CONNECTION
wlp3s0 wifi unavailable --
enp0s31f6 ethernet unmanaged --
lo loopback unmanaged --
...
$ cat /etc/netplan/*.yaml | grep renderer
renderer: networkd
$ nm-online ....... ....... 0s [offline]
Connecting.
$ curl -i http:// connectivity- check.ubuntu. com/ r-Status: online
...
X-NetworkManage
$ lsb_release -a
...
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04