I also encounter this problem,I wish someone can hlpe me.thank you!
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Edit file /etc/sysctl.conf,
vi /etc/sysctl.conf
Add the following lines:
net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1
If you want to disable IPV6 for particular network card, for example enp0s3, add the following entry.
net.ipv6.conf.enp0s3.disable_ipv6 = 1
Save and exit the file.
Execute the following command to reflect the changes.
sysctl -p