Same here, issue is worked around with "ethtool -s eth2 autoneg off"
ethtool -s eth2 autoneg off
lspci -v -s 02:00.0
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI
Express Gigabit Ethernet controller (rev 03)
Subsystem: ASUSTeK Computer Inc. Device 83a3
Flags: bus master, fast devsel, latency 0, IRQ 27
I/O ports at d800 [size=256]
Memory at f8fff000 (64-bit, prefetchable) [size=4K]
Memory at f8ff8000 (64-bit, prefetchable) [size=16K]
Expansion ROM at feaf0000 [disabled] [size=64K]
Capabilities: [40] Power Management version 3
Capabilities: [50] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0
Enable+
Capabilities: [70] Express Endpoint, MSI 01
Capabilities: [ac] MSI-X: Enable- Mask- TabSize=4
Capabilities: [cc] Vital Product Data <?>
Capabilities: [100] Advanced Error Reporting <?>
Capabilities: [140] Virtual Channel <?>
Capabilities: [160] Device Serial Number 00-00-00-00-00-00-00-00
Kernel driver in use: r8169
Kernel modules: r8169
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r8169 fails to autonegotiate speed/duplex
https://bugs.launchpad.net/bugs/564984
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