artfullpac

This is guidance for those with integrated Realtek RTL8111 series gigabit Ethernet, built in to motherboards such as the ASRock G41M-LE.
Ubuntu 8.10 (and may other versions) have been reporting problems with connectivity. Here is the solution in a walk-through format. You must be root (sudo su -).
1) Check to see if the r8169 module is loaded
-> lsmod grep r816
r8168 41104 0
-> lspci -v
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03)
Subsystem: ASRock Incorporation Device 8168
Kernel driver in use: r8169
Kernel modules: r8169
2) Download the official Realtek driver
Realtek RTL8111/RTL8168
3) Remove the r8169 module
-> rmmod r8169
-> mv /lib/modules/`uname -r`/kernel/drivers/net/r8169.ko ~/r8169.ko.backup
( the ` is a backtick, it is not an apostrophe or single quote )
4) Build the new r8168 module for the kernel
-> bzip2 -d r8168-8.009.00.tar.bz2
-> tar -xf r8168-8.009.00.tar
-> cd r8168-8.009.00
-> make clean modules
-> make install
5) Rebuild the kernel module dependencies
-> depmod -a
-> insmod ./src/r8168.ko
6) Remove the r8169 module from initrd
-> mv /initrd.img ~/initrd.img.backup
-> mkinitramfs -o /boot/initrd.img-`uname -r` `uname -r`
7) Add r8168 module to /etc/modules
-> echo 'r8168' >> /etc/modules
8) Reboot, You are done!
9) Examine that ONLY the r8168 module is loaded for the interface
-> lspci -v
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03)
Subsystem: ASRock Incorporation Device 8168
Kernel driver in use: r8168
Kernel modules: r8168
If you need to, configure your /etc/network/interfaces for dhcp or static address then `sudo ifup eth0`