Am Freitag 22 Juni 2018 schrieb William Morder:
> So here's the problem: I got my network working reasonably well, except for 
> one glitch, that it automatically connects at startup. I've tried wicd and 
> tdenetworkmanager, as well as the knetworkmanager. Also I've dabbled with 
> pretty much every other network management tool, and nothing changes. I set 
> the manager so that it does not connect automatically (which worked fine for 
> me in Debian Jessie), but now it keeps resetting the configuration, and 
> automatically connects on startup. 
> 
> After I am up and running, I am able to connect and disconnect with few 
> problems, but this is really annoying. 
> 
> Is it better to change the configuration file in one of these locations? 
> /etc/network/interfaces
> /etc/NetworkManager/NetworkManager.conf

Hello Bill,

in case I understood correctly and you don't want to connect to the internet at boot time, have you tried this in "/etc/default/networking"?:

# Set to 'no' to skip interfaces configuration on boot
#CONFIGURE_INTERFACES=yes

Regards,
Stefan