i had the same issue. I've managed to solve it by change managed=true in
/etc/NetworkManager/nm-system-settings.conf. I have a wired DHCP connection.
The wired connection appear as ifupdown (eth0) in Network Connection and I
cannot change it or delete it (gave me the "Updating connection failed:
nm-ifupdown-connection.c.82 - connection update not supported (read-only).."
error. Also I have to mannualy type the mac adress . I can make a new wired
connection and set it to manual configuration.
my curent ifconfig -a status:
eth0 Link encap:Ethernet HWaddr 00:16:e6:11:da:93
inet addr:192.168.1.209 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::216:e6ff:fe11:da93/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:73361 errors:0 dropped:0 overruns:0 frame:0
TX packets:55244 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:84071075 (84.0 MB) TX bytes:4529812 (4.5 MB)
Interrupt:23 Base address:0xa000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2114 errors:0 dropped:0 overruns:0 frame:0
TX packets:2114 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:111548 (111.5 KB) TX bytes:111548 (111.5 KB)
pan0 Link encap:Ethernet HWaddr 26:35:e8:d8:da:2c
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
--
Network Manager claims devices are unmanaged
https://bugs.launchpad.net/bugs/280417
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