Can't apt-get update, "temporary failure resolving".

Hey, I’m using a newly rebuilt Debian 9 image and I can’t successfully execute apt-get update. I’ve seen several similar questions asked here, none helped me. I can ping to or other websites, even; is present in my /etc/resolv.conf, but still, right after having rebuilt the droplet, ssh-ed into it and changed the root password, the command doesn’t work.

Here’s the exact error message I get:

root@whatever:~# apt-get update
Err:1 stretch InRelease
  Temporary failure resolving ''
Err:2 stretch/updates InRelease
  Temporary failure resolving ''
Err:3 stretch-updates InRelease
  Temporary failure resolving ''
Reading package lists... Done
W: Failed to fetch  Temporary failure resolving ''
W: Failed to fetch  Temporary failure resolving ''
W: Failed to fetch  Temporary failure resolving ''
W: Some index files failed to download. They have been ignored, or old ones used instead.

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Seems that /etc/resolv.conf have wrong permissions

-rw-rw---- 1 root root 19 Jan 11 18:16 /etc/resolv.conf

this file must have +r for all users, execute following command to fix them:

chmod 644 /etc/resolv.conf

the result must be:

-rw-r--r-- 1 root root 19 Jan 11 18:16 /etc/resolv.conf

I just had this same problem and for me it was because I set up a firewall to limit all incoming & outgoing traffic to just my IP. Removing that firewall fixed the issue.

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