How to turn off ubuntu's IPv6
Modify the /etc/sysctl.conf file and add the following
Lazy version
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net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1
net.ipv6.conf.lo.disable_ipv6=1
Execute sysctl -p to make the settings take effect
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echo "net.ipv6.conf.all.disable_ipv6=1 \n
net.ipv6.conf.default.disable_ipv6=1 \n
net.ipv6.conf.lo.disable_ipv6=1 \n ">> /etc/sysctl.conf