I'm having the exact same problem (fresh install of 8.2.5; used the Windows SD card tool to install). Adding "Wait for network" or trying to refresh the repositories does not help. I can browse the SMB shares of the Kodi installation from a Windows computer on my network, but Kodi is unable to see the SMB network (even though I added SMB1->SMB3). I can login to Kodi via SSH and it has a IP adress. In other words, it's not a network issue. I'm having an older (Kodi 17.3) OpenElec setup that works just fine on the same network.
To me, it seems the installation procedure is buggy as hell.