Public bug reported:

Version - Ubuntu/Xubuntu - 11.10 amd64
Kernel - 3.0.0-15-generic

By default Ubuntu selects the r8169 driver for my network adapter. To
some extent it works but it is hardly useable. Transfer speeds are very
low and often connections time out. Packet loss is through the roof.
Other users have reported that after some time the driver will crash and
cause the entire system to lock up. The current solution for those of us
with this problem is to download and build the r8168 drivers from reltek
as seen here. http://djlab.com/2010/10/fixing-rtl8111-8168b-driver-
debian-ubuntu/

lsusb output - post fix
08:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI 
Express Gigabit Ethernet controller (rev 06)
        Subsystem: Giga-byte Technology GA-EP45-DS5 Motherboard
        Flags: bus master, fast devsel, latency 0, IRQ 51
        I/O ports at de00 [size=256]
        Memory at fbbff000 (64-bit, prefetchable) [size=4K]
        Memory at fbbf8000 (64-bit, prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: r8168
        Kernel modules: r8168, r8169

Kernel logs attached from before I updated the driver.

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: 8168b drivers network r8168 rtl8111

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https://bugs.launchpad.net/bugs/920237

Title:
  r8169 driver doesn't play nice with RTL8111/8168B

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