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After a fresh installation of 14.04, I had various troubles with the ethernet NIC.  Long story short, there were duplicate entries in /etc/udev/rules.d/70-persistent-net.rules .
The 70-persistent-net.rules file has 5 entries for a 4 port NIC (Broadcom Corporation NetXtreme BCM5720 Gigabit Ethernet PCIe).

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    # PCI device 0x14e4:0x165f (tg3)
    SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="54:9f:35:09:8f:69", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

    # PCI device 0x14e4:0x165f (tg3)
    SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="54:9f:35:09:8f:6b", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth3"

    # PCI device 0x14e4:0x165f (tg3)
    SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="54:9f:35:09:8f:68", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

    # PCI device 0x14e4:0x165f (tg3)
    SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="54:9f:35:09:8f:6a", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2"

    # this last declaration was generated by udev but overrides prior command with same ATTR{address} value.
    # PCI device 0x14e4:0x165f (tg3)
    SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="54:9f:35:09:8f:68", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth4"


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lspci shows only 4 PCI devices.

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$ lspci -vn | grep -A 16 -F '14e4:165f'

    01:00.0 0200: 14e4:165f
	    Subsystem: 1028:1f5b
	    Flags: bus master, fast devsel, latency 0, IRQ 41
	    Memory at 91b30000 (64-bit, prefetchable) [size=64K]
	    Memory at 91b40000 (64-bit, prefetchable) [size=64K]
	    Memory at 91b50000 (64-bit, prefetchable) [size=64K]
	    Expansion ROM at 91b80000 [disabled] [size=256K]
	    Capabilities: [48] Power Management version 3
	    Capabilities: [50] Vital Product Data
	    Capabilities: [58] MSI: Enable- Count=1/8 Maskable- 64bit+
	    Capabilities: [a0] MSI-X: Enable+ Count=17 Masked-
	    Capabilities: [ac] Express Endpoint, MSI 00
	    Capabilities: [100] Advanced Error Reporting
	    Capabilities: [13c] Device Serial Number 00-00-54-9f-35-09-8f-68
	    Capabilities: [150] Power Budgeting <?>
	    Capabilities: [160] Virtual Channel
	    Kernel driver in use: tg3
    --
    01:00.1 0200: 14e4:165f
	    Subsystem: 1028:1f5b
	    Flags: bus master, fast devsel, latency 0, IRQ 45
	    Memory at 91b00000 (64-bit, prefetchable) [size=64K]
	    Memory at 91b10000 (64-bit, prefetchable) [size=64K]
	    Memory at 91b20000 (64-bit, prefetchable) [size=64K]
	    Expansion ROM at 91bc0000 [disabled] [size=256K]
	    Capabilities: [48] Power Management version 3
	    Capabilities: [50] Vital Product Data
	    Capabilities: [58] MSI: Enable- Count=1/8 Maskable- 64bit+
	    Capabilities: [a0] MSI-X: Enable- Count=17 Masked-
	    Capabilities: [ac] Express Endpoint, MSI 00
	    Capabilities: [100] Advanced Error Reporting
	    Capabilities: [13c] Device Serial Number 00-00-54-9f-35-09-8f-69
	    Capabilities: [150] Power Budgeting <?>
	    Capabilities: [160] Virtual Channel
	    Kernel driver in use: tg3
    --
    02:00.0 0200: 14e4:165f
	    Subsystem: 1028:1f5b
	    Flags: bus master, fast devsel, latency 0, IRQ 40
	    Memory at 91a30000 (64-bit, prefetchable) [size=64K]
	    Memory at 91a40000 (64-bit, prefetchable) [size=64K]
	    Memory at 91a50000 (64-bit, prefetchable) [size=64K]
	    Expansion ROM at 91a80000 [disabled] [size=256K]
	    Capabilities: [48] Power Management version 3
	    Capabilities: [50] Vital Product Data
	    Capabilities: [58] MSI: Enable- Count=1/8 Maskable- 64bit+
	    Capabilities: [a0] MSI-X: Enable- Count=17 Masked-
	    Capabilities: [ac] Express Endpoint, MSI 00
	    Capabilities: [100] Advanced Error Reporting
	    Capabilities: [13c] Device Serial Number 00-00-54-9f-35-09-8f-6a
	    Capabilities: [150] Power Budgeting <?>
	    Capabilities: [160] Virtual Channel
	    Kernel driver in use: tg3
    --
    02:00.1 0200: 14e4:165f
	    Subsystem: 1028:1f5b
	    Flags: bus master, fast devsel, latency 0, IRQ 44
	    Memory at 91a00000 (64-bit, prefetchable) [size=64K]
	    Memory at 91a10000 (64-bit, prefetchable) [size=64K]
	    Memory at 91a20000 (64-bit, prefetchable) [size=64K]
	    Expansion ROM at 91ac0000 [disabled] [size=256K]
	    Capabilities: [48] Power Management version 3
	    Capabilities: [50] Vital Product Data
	    Capabilities: [58] MSI: Enable- Count=1/8 Maskable- 64bit+
	    Capabilities: [a0] MSI-X: Enable- Count=17 Masked-
	    Capabilities: [ac] Express Endpoint, MSI 00
	    Capabilities: [100] Advanced Error Reporting
	    Capabilities: [13c] Device Serial Number 00-00-54-9f-35-09-8f-6b
	    Capabilities: [150] Power Budgeting <?>
	    Capabilities: [160] Virtual Channel
	    Kernel driver in use: tg3


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Description:	Ubuntu 14.04.2 LTS
Release:	14.04

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: udev
-- 
udev duplicates entries in 70-persistent-net.rules
https://bugs.launchpad.net/bugs/1470399
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