Ubuntu/IPv6

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Disable IPv6

cat >> /etc/sysctl.conf << "EOF"
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
EOF
sudo sysctl -p

Boot Setting: 

/etc/default/grub
 GRUB_CMDLINE_LINUX="ipv6.disable=1"

sudo update-grub
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