Issue: WLAN works fine with NetworkManager Wired Device (ethX) is marked as “ unmanaged ” and doesn’t work even if it gets DHCP-lease/IP-address /etc/network/interfaces looks correct Solution: Open root terminal and type leafpad / etc/NetworkManager/NetworkManager.conf and then edit ... [ifupdown] managed=true ... Save the file. Inorder, to make the changes to come to an effect, type /etc/init.d/network-manager force-reload