We had a similar issue. We realized that (in our case) the problem was
the Spanning Tree time to converge.

Explication: when PXE boots get an IP from DHCP server, and then when Linux 
starts, the interface go down and up, and Linux try to get IP from DHCP server 
again, but fails after 35 seconds aprox.
But the physical-switch delays 12 seconds to get the port up agian, and 30 
seconds to converge the Spanning Tree. So changing the port configuration to: 
spanning-tree portfast, o  spanning-tree portfast trunk (incase of a trunk), 
the Spanning Tree delay disappears, and Linux can get the IP from DHCP-server 
before the timeout ends.

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https://bugs.launchpad.net/bugs/1327412

Title:
  Delay during PXE Boot, IP-Config gives up

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