Ubuntu : Ubuntu resolv.conf nameserver เปลี่ยน

Ubuntu : Ubuntu resolv.conf nameserver เปลี่ยน ทำให้ออกเน็ตไม่ได้
ค่าเดิม

nameserver 127.0.0.53

วิธีแก้

# Use Google's public DNS servers.
nameserver 8.8.4.4
nameserver 8.8.8.8

But things change and now it’s not that simple. If you now edit /etc/resolv.conf on Ubuntu you’ll find that the edits are ephemeral. If you restart (or even hibernate) your machine then they’ll be overwritten by default content.

nameserver 127.0.0.53
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This is pretty simple to fix though.
1.Install the resolvconf package.

1. sudo apt install resolvconf

2. Edit /etc/resolvconf/resolv.conf.d/head and add the following:

1. # Make edits to /etc/resolvconf/resolv.conf.d/head.
2. nameserver 8.8.4.4
3. nameserver 8.8.8.8

3. Restart the resolvconf service.

1. /etc/init.d/resolvconf restart

Fix should be permanent.
https://datawookie.netlify.app/blog/2018/10/dns-on-ubuntu-18.04/