How to Disable IPV6 in Ubuntu Jaunty

IPV6 is enabled by default in Ubuntu Jaunty 9.04, even if you upgraded from an old version of Ubuntu. So if you want to disable it:

1. Check if you have it enabled or not (just in case) so write this in a terminal:

cat /proc/sys/net/ipv6/conf/all/disable_ipv6

0 = enabled, 1 = disabled - so if you got a 0 in the terminal, then it's enabled and you need to proceed to step 2 to disable it.

2. Write this in a terminal:

sudo su -
echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6

If you do no have that directory, you can edit your grub menu:

nano -w /boot/grub/menu.lst

and add :

ipv6.disable=1

to your kernel.

And you are done, try it again to see if it's disabled (step 1).