Dear All,
I have encountered an issue with Network Interfaces on Debian Testing with KDE-Plasma 5.8.2. If a pc change fast the type of connection between a lan and a wlan, NewtorkManager cannot address the change and although there is an ip for both interfaces you will not have access to internet. What i have done is to set the parameter *managed=true* on */etc/NetworkManager/NetworkManager.conf* and then *systemctl restart NetworkManager* to take into account the change.
I just wanted to report it in case someone else faced it. Kind Regards, Diamantis