[Bug 1250922] [NEW] dhclient: No DHCPOFFERS received

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I have 14 x Dell c6100 servers running ubuntu 12.04 Lts. Plus  2x
running ubuntu 10 lts (they work fine). Have been running fine for a
year. The systems are updated regularly. After a update + reboot they
fail to get a IP from the DHCP server.

In the syslog I see that the dhclient dhcpdiscover on eth0 to 255...
then dhclient: No DHCPOFFERS received

The onboard chip is: Intel 82576
The DHCP server is also running Ubuntu 12.04 lts.

Have there been any changes to the dhcp-client that might explain this.

I have tried disabling ufw and apparmor, but still nowhere.

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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dhclient: No DHCPOFFERS received
https://bugs.launchpad.net/bugs/1250922
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