I am having a similar problem. Live CD and install have been fine but
during restart following a suspend or hibernate the ethernet does not
come back.

Normal lspci -vvnn:
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. 
RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 02)
        Subsystem: Dell Unknown device [1028:0278]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 219
        Region 0: I/O ports at be00 [size=256]
        Region 2: Memory at fd8ff000 (64-bit, non-prefetchable) [size=4K]
        Region 4: Memory at fdef0000 (64-bit, prefetchable) [size=64K]
        [virtual] Expansion ROM at fde00000 [disabled] [size=128K]
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA 
PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [50] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 
Enable+
                Address: 00000000fee0f00c  Data: 413a
        Capabilities: [70] Express Endpoint IRQ 1
                Device: Supported: MaxPayload 256 bytes, PhantFunc 0, ExtTag-
                Device: Latency L0s <512ns, L1 <8us
                Device: AtnBtn- AtnInd- PwrInd-
                Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
                Device: RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
                Device: MaxPayload 128 bytes, MaxReadReq 512 bytes
                Link: Supported Speed 2.5Gb/s, Width x1, ASPM L0s L1, Port 0
                Link: Latency L0s <512ns, L1 <64us
                Link: ASPM Disabled RCB 64 bytes CommClk+ ExtSynch-
                Link: Speed 2.5Gb/s, Width x1
        Capabilities: [b0] MSI-X: Enable- Mask- TabSize=2
                Vector table: BAR=4 offset=00000000
                PBA: BAR=4 offset=00000800
        Capabilities: [d0] Vital Product Data

After restart from suspend:
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. 
RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev ff) 
(prog-if ff)
        !!! Unknown header type 7f

Needless to say eth0 fails

-- 
RTL8102EL NIC driver oops during Hardy boot
https://bugs.launchpad.net/bugs/223656
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