Comment 18 for bug 34958

This seems to be fixed as described in this duplicate bug report:
https://launchpad.net/bugs/48263

I have been using this method with my Averatec model 3250HX-01 without incident for the last week.

However, you need to follow these steps first:
1) edit /boot/grub/menu.lst as root ( sudo nano /boot/grub/menu.lst )
2) Look for the first section similar to:
title Ubuntu, kernel 2.6.xxxxxxx-k7
root (hd0,2)
kernel /boot/vmlinuz-2.6.xxxxxxxxx-k7 root=/dev/hda3 ro quiet splash
initrd /boot/initrd.img-2.6.xxxxxxxx-k7
savedefault
boot
3) At the end of the "kernel" line, add "acpi=noirq" so it looks like this:
kernel /boot/vmlinuz-2.6.xxxxxxxxx-k7 root=/dev/hda3 ro quiet splash acpi=noirq
4) Save the file, reboot the machine

Once you have rebooted, you will have network capabilities. Perform a full system update / upgrade, including kernel. The menu.lst file should update itself accordingly and the new kernel versions from now on will include the equivalente acpi=noirq option.