IPv6 may be managed using sysctl:
bash
cat - > /etc/sysctl.d/ipv6-disable.conf <<EOF
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
EOF
sysctl --systemConfirm IPv6 unbound,
bash
ip -6 addr
# Reports emptyRegenerate all configuration,
bash
upcp -sb