How to disable IPv6 in Ubuntu 14.04?

To disable ipv6, you have to open /etc/sysctl.conf using any text editor and insert the following lines at the end:
 net.ipv6.conf.all.disable_ipv6 = 1
 net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

If ipv6 is still not disabled, then the problem is that sysctl.conf is still not activated.
 $ sudo sysctl -p

You will see this in the terminal:
 net.ipv6.conf.all.disable_ipv6 = 1
 net.ipv6.conf.default.disable_ipv6 = 1
 net.ipv6.conf.lo.disable_ipv6 = 1

After that, if you run:
 $ cat /proc/sys/net/ipv6/conf/all/disable_ipv6

It will report:

 1

If you see 1, ipv6 has been successfully disabled.

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