Where is network configuration "hidden" on Ubuntu 16.04?

[Mark Constable]

On 08/10/18 10:57, Little Girl wrote:
>> Where else can I look for the remnnts of the "5" configuration which
>> are being applied at boot and preventing parts of the file-based
>> configuration from working?  I even decompressed a copy of
>> initrd.img... and found nothing.
> [...]
> If nothing else, hopefully this message will draw attention to your
> original message and maybe someone with a more appropriate solution
> will join in.

I find this alias useful to search or query various config settings...

alias q='find -type f -print0 | xargs -0 grep '

then "cd /etc" (most often) and ie; "q 12.34.56.78" the IP being set
from the previous 5 machine on the 2 machine. Change the IP for any
unique info related to the other machine and you may locate the
remnants of old config files. /var/lib/ is another place to look.