This also affected my machines. Thanks to the forum reference I was able
to piece together this:
The file belonging to network-manager /usr/lib/NetworkManager/conf.d/10
-globally-managed-devices.conf contains:
[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:wwan
Curiously, at least on my machines, this also knocked out "gsm" type
connection which made me offline as I rely on 3G connections often.
The "solution" is to create an empty file at
/etc/NetworkManager/conf.d/10-globally-managed-devices.conf the presence
of which overrides the distribution packaged default.
I consider this a critical error as it can result in inability to
connect typical system to the network to pull in updates that would
resolve the problem.
** Changed in: network-manager (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1716034
Title:
Network manager stops managing Ethernet links after upgrade
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