Disable Ipv6:

Edit the file – /etc/sysctl.conf

$ sudo gedit /etc/sysctl.conf

And fill in the following lines at the end of that file

# IPv6 disabled
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

Save the file and close it

Restart sysctl with

$ sudo sysctl -p

Reference:
http://www.binarytides.com/disable-ipv6-ubuntu/

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