I've Done A Really Bad Thing

[Tom H]

On Mon, May 20, 2013 at 11:35 PM, Toshi Esumi <ubuntu at toshiesumi.com> wrote:
> On Mon, 2013-05-20 at 16:00 -0500, John Graddy wrote:
>>
>> I'm afraid that I've done an incredibly stupid thing.  First. I removed
>> IPV6 from my system.  Second, I upgraded to Ubuntu13.04. Third, I
>> misplaced the instructions for deleting IPV6.  Now, I evidently need
>> IPV6 and don't know how to reverse my past sins  can someone help me
>> out?   I think that I removed ipV6 by changing a configuration file and
>> then remaking Grub.
>
> I don't know how you could disable ipV6 using grub when it boots up, and
> although I haven't done it myself, my google seach found a way
> (/etc/sysctl.conf) doing that. If you haven done this way, you just need
> to undo it.
>
> http://linuxpoison.blogspot.tw/2010/10/how-to-disable-ipv6-in-ubuntu-linux.html

You can add "ipv6.disable=1" to the kernel common-line to disable ipv6.

To the OP:

You have to edit "/etc/default/grub" and run "update-grub".