I got a F26 machine using systemd-networkd instead of NetworkManager, which was disabled by using systemctl. After having runned F26->F27 upgrade the machine was no longer able to reach the internet. # ip addr has shown different IP addresses compared to the ones I have setted into systemd-networkd scripts. I immediately checked if NetworkManager was running and indeed it was running, overwhelming systemd-networkd settings. Then to resume normal network functionalities I disabled again NetworkManager # systemctl disable --now NetworkManager and then restarted systemd-networkd service
sounds like a duplicate of bug 1513613
*** This bug has been marked as a duplicate of bug 1513613 ***