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By default Ubuntu comes with IPv6 enabled. When you don't have an IPv6 Internet connection or you want to disable IPv6 from a security perspective, it's easy to disable:

1. sudo su

2. echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf

3. option 1: reboot

3. option 2: sysctl -p