I was working on a KUbuntu laptop today and i noticed the internet was very slow for some reason. The internet connection was dhcpd enabled, i tried manual configuration.... same... slow slow slow.... Booted up to the Windows partition and the connection was fine. Back to ubuntu the browsing was too slow again, double checked the resolv.conf, ip, mask, broadcast etc, everything was fine. I disable the ipv6 by mistake, and the internet connection was at normal speeds! I dont know about you guys with *Ubuntu systems if you have slow... whatever.... if you have try to disable the ipv6 IF you dont use it.
Open your favorite editor to /etc/modprobe.d/aliases Go to the line "alias net-pf-10 ipv6" and replace with this one: "alias net-pf-10 off" Save the file and reboot the system"