"Enable roaming mode" basically removes any device configuration from /etc/network/interfaces and allows NetworkManager to take care of it. Disabling roaming mode will take control away from NetworkManager. So you will be unable to connect via system tray icon. This is perfectly expected behaviour.
"Enable roaming mode" basically removes any device configuration from /etc/network/ interfaces and allows NetworkManager to take care of it. Disabling roaming mode will take control away from NetworkManager. So you will be unable to connect via system tray icon. This is perfectly expected behaviour.