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[Serge <masterwrks@xxxxx>]

Affects even running 14.04 from live CD. On fresh install network
manager does not work also, even setting static IPs. Ping says
destination host unreachable 99% queries and very long timeout 1%. This
means network does not work at all.

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https://bugs.launchpad.net/bugs/1310746

Title:
  NetworkManager wired ethernet times out waiting for dhcp on 14.04
  trusty tahr

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

Bug description:
  I'm experiencing dhcp timeouts on 14.04 that I didn't experience in
  earlier releases (13.10 and 12.04 are in use in the office). Others in
  my office have similar complaints that "wired ethernet stops working
  in 14.04" which all equate to a dhcp timeout. When switching back to
  13.10 dhcp works flawlessly.

  network-manager 0.9.8.8-0ubuntu7 (the current version on trusty) contains the following changelog:
  * debian/tests/nm: Bump DHCP timeouts from 15 to 20 seconds, something in
      the stack got even slower as it used to be.
    * debian/tests/nm: With the patch in 0.9.8.8-0ubuntu5, interfaces with PE
      disabled still get a temporary IP. Disable that check for now.
   -- Martin Pitt <________@xxxxxxxxxx>   Wed, 09 Apr 2014 15:41:11 +0200

  I don't think increasing the timeout in the test in order to get it to
  pass is the correct approach. It's likely masking the underlying issue
  that we're experiencing.

  ------ 
  1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
  Description:	Ubuntu 14.04 LTS
  Release:	14.04
   
  2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
  network-manager:
    Installed: 0.9.8.8-0ubuntu7
    Candidate: 0.9.8.8-0ubuntu7
    Version table:
   *** 0.9.8.8-0ubuntu7 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status
  isc-dhcp-client:
    Installed: 4.2.4-7ubuntu12
    Candidate: 4.2.4-7ubuntu12
    Version table:
   *** 4.2.4-7ubuntu12 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status
  isc-dhcp-common:
    Installed: 4.2.4-7ubuntu12
    Candidate: 4.2.4-7ubuntu12
    Version table:
   *** 4.2.4-7ubuntu12 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

  3) What you expected to happen
  Ethernet to "just work"

  4) What happened instead
  Wired ethernet times out waiting for a dhcp connection. This does not occur on the same hardware using past releases of Ubuntu. It also doesn't happen when connecting via wireless.

  
  debug logs attached: sudo python debug-helper.py --nm debug ; tail -n0 -f /var/log/syslog | sed -e '/get_active_ap/d' -e '/dump_route/d' > /tmp/syslog

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