Disabling IPv6

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Disabling IPv6 for ubuntu server 9.10

Modify Grub bootloader.

sudo pico /etc/default/grub 

Modify Line

GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash” 

to 

GRUB_CMDLINE_LINUX_DEFAULT=”ipv6.disable=1 quiet splash” 

Then update grub and reboot.

sudo update-grub

sudo reboot