Got it, I understand what you mean now.
Unfortunately, the configuration is not "reset" if you delete all
available connections, you'll likely want to go back to nm-applet and
click on the wired device (a connection in nm-applet named "Auto
ethernet" or something like it) to allow it to connect, which should
create a new DHCP configuration.
In other words, after cancelling connections, when there is nothing
listed in the Connection Editor, you'll want to go back to nm-applet and
click on the "automatic" entry that should be there (you may need to
disconnect and reconnect the cable for it to appear).
As far as I can tell, this properly handles the cases where someone
deleted all the configurations, and allows one to recover from the
customized connections being deleted. "no-auto-default" is required to
avoid re-creating a default connection which would be automatically
tried when a cable is connected.
Still, there doesn't seem to be a bug here, so I'm setting this back to
Invalid.
** Changed in: network-manager (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1059065
Title:
Network Manager does not connect the network adapter to a network with
a DHCP server automatically
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