Mathieu Trudel's suggestion did not work for me after coenting-out 
"no-auto-default=00:01:80:76:71:ca," from 
/etc/NetworkManager/nm-system-settings.conf and restarting.

Also, my /etc/network/interfaces only has the following lines.  There is
no reference to eth0, so, whti reference to Petar Velkovski's
suggestion. there was nothing for me to comment out:

Here is my /etc/network/interfaces file...
    auto lo
    iface lo inet loopback

Even dhclient & network-manager restart "approach" is trial and error.

In my syslog, I see "bluez error getting default adapter: The name
org.bluez was not provided by any .service files."  I do not know if it
related to this issue or is a separate problem.


Here is a portion of my syslog file that shows eth0 is brought up, and then it 
goes down (with reason 2 ???)...

Oct 17 04:44:48 Computer-1000 NetworkManager[2046]:    Ifupdown: get unmanaged 
devices count: 0
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]:    SCPlugin-Ifupdown: 
(33466944) ... get_connections.
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]:    SCPlugin-Ifupdown: 
(33466944) ... get_connections (managed=false): return empty list.
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]:    Ifupdown: get unmanaged 
devices count: 0
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]: <info> WiFi enabled by 
radio killswitch; enabled by state file
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]: <info> WWAN enabled by 
radio killswitch; enabled by state file
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]: <info> WiMAX enabled by 
radio killswitch; enabled by state file
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]: <info> Networking is 
enabled by state file
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]: <info> (eth0): carrier is 
OFF
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]: <info> (eth0): new Ethernet 
device (driver: 'e1000e' ifindex: 2)
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]: <info> (eth0): exported as 
/org/freedesktop/NetworkManager/Devices/0
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]: <info> (eth0): now managed
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]: <info> (eth0): device state 
change: 1 -> 2 (reason 2)
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]: <info> (eth0): bringing up 
device.
Oct 17 04:44:48 Computer-1000 kernel: [  894.570244] e1000e 0000:00:19.0: irq 
40 for MSI/MSI-X
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]: <info> (eth0): preparing 
device.
Oct 17 04:44:48 Computer-1000 NetworkManager[2046]: <info> (eth0): deactivating 
device (reason: 2).

-- 
[Maverick] Auto eth0 not working after latest package upgrade
https://bugs.launchpad.net/bugs/635475
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