I tried kernel 3.5.0-030500rc1-generic (with extra e header). The problem is 
the same.
I tried so:
- I de-blacklisted r8169
- I installed new kernel 
- rebooted
- problem the same

So I have installed last driver of realtek so:
$ sudo -s
# rmmod r8169
# mv 
'/lib/modules/3.5.0-030500rc1-generic/kernel/drivers/net/ethernet/realtek/r8169.ko'
 ~/r8169.ko.backup
# cd /varie/down/linux/r8168-8.031.00
# make clean modules
# make install
# depmod -a
# insmod ./src/r8168.ko
# mv /initrd.img ~/initrd.img.backup
# mkinitramfs -o /boot/initrd.img-`uname -r` `uname -r`
# echo “r8168′′ >> /etc/modules
reboot

Problem the same.

lspci -v

02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI 
Express Gigabit Ethernet controller (rev 03)
        Subsystem: Hewlett-Packard Company Device 2a9c
        Flags: bus master, fast devsel, latency 0, IRQ 47
        I/O ports at d800 [size=256]
        Memory at fbdff000 (64-bit, non-prefetchable) [size=4K]
        Memory at faffc000 (64-bit, prefetchable) [size=16K]
        Expansion ROM at fbdc0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: r8168
        Kernel modules: r8168

lshw -C network

 *-network
       description: Ethernet interface
       product: RTL8111/8168B PCI Express Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: eth0
       version: 03
       serial: 40:61:86:c3:e1:34
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list rom 
ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8168 
driverversion=8.031.00-NAPI duplex=full ip=192.168.1.129 latency=0 link=yes 
multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:47 ioport:d800(size=256) memory:fbdff000-fbdfffff 
memory:faffc000-faffffff memory:fbdc0000-fbddffff


Maybe a problem with Networkmanager?

** Attachment added: "syslog.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1007236/+attachment/3177610/+files/syslog.txt

** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream

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https://bugs.launchpad.net/bugs/1007236

Title:
  Realtek RTL8111/8168B wired network interface goes up and down at
  random

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