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[amichair <1385709@xxxxxxxxxxxxxxxxxx>]

After wasting a whole day on this, I think I found the culprit. I had to
delete a whole bunch of files named 'sendmail' which were scattered
around /etc (/etc/ppp/ip-up.d/sendmail /etc/ppp/ip-down.d/sendmail
/etc/network/if-post-down.d/sendmail /etc/network/if-up.d/sendmail
/etc/network/if-down.d/sendmail /etc/dhcp3/dhclient-exit-
hooks.d/sendmail /etc/resolvconf/update-libc.d/sendmail, and there are a
few more that should probably also be deleted). Note that I do not have
the sendmail package installed at all!

I do not know, however, why the upgrade to 14.10 triggered this failure.
Maybe it removed something related to sendmail, or started doing
something with these files that were previously ignored... dunno. In any
case, it's a pretty serious upgrade bug, since it prevents the network
from connecting, and is quite non-trivial to trace back to its origin
(there were lots of other errors/warnings in syslog that seemed related
but weren't, and nothing there about these sendmail files or a hint as
to the cause of failure).

The indirect reason this happens on wired connections is probably that
there is a correlation between hosts which at some point had sendmail
installed and those that are on a wired connection :-)

Please fix this issue quickly before others upgrade and lose their
connectivity... (already encountered someone else with the same
symptoms).

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Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1385709

Title:
  network-manager service doesn't start at boot time

Status in “network-manager” package in Ubuntu:
  New

Bug description:
  I just completed the upgrade from Kubuntu 14.04 to 14.10. Haven't had
  any network trouble before the upgrade. After the upgrade, the
  network-manager service does not start when the computer boots up -
  the Kubuntu splash screen says 'waiting for network configuration',
  then 'waiting another 60 seconds for network configuration' (or
  something like that), then finally boots up without a network
  connection. Also the Network Management tray icon tooltip says that
  the network-manager service is not running. However if I then manually
  open the terminal and run 'sudo service network-manager start', then
  it starts ok and the network connects within a few seconds and
  everything works ok until the next reboot. I'm on a desktop PC with a
  wired LAN connection and no wifi adapter. network-manager version is
  0.9.8.8-0ubuntu28.

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