Re: no network after jessie -> stretch
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.
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