Re: no network after jessie -> stretch

[Fungi4All]

My fix in such occassions has been to download in a medium commonly used 
(stick, common partition with a system that
has net access) the .deb packages for connman and cmst and install them to the 
isolated system using dpkg, then reboot.
Most likely whatever previous networking set-up there is connman will override 
and fix for you. Especially helpful with wifi.
I will probably get some heat from the anti-gui brigade but if it is a quick 
fix and you get online then you can figure it all out
and correct whatever .conf there was a glitch at.