the ifupdown connection is parsed from your /etc/network/interfaces.
Usually that device is then unmanaged as its upped by ifupdown package.
at best remove your device configuration from /etc/network/interfaces if
you want to use NM at all.
** Changed in: network-manager (Ubuntu)
Status: Incomplete => Invalid
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wired connection doesn't connect automatically
https://bugs.launchpad.net/bugs/289864
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