Disable IPV6 on Ubuntu.
Some people feel loading IPV6 can improve the network performance and if your ISP doesn't support IPV6 yet (which most do not) then it will do no harm to disable it.
sudo nano /etc/modprobe.d/blacklistappend the following line:blacklist ipv6
Save the file and restart your machine!You can verify that ipv6 is actually disabled using the following command:
ip a | grep inet6
If you see no ouput then IPV6 is now disabled.