Unable to download security updates

[morse_the_horse]

Debian Buster with Cinnamon and Gnome installed the other day. I have another system with the same software and an Ubuntu system.

System shows I have updates. When I select updates in Software, I get the following message:

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Unable to download updates:
failed to refresh cache: E: http://security.debian.org/debian-security buster/updates InRelease is not (yet) available (Could not resolve 'security.debian.org')

I get "could not resolve hostname" on other sites.

I can http to the security.debian.org with browser without problem.

Sources.list file is as installed. I have not touched it:

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# deb cdrom:[Debian GNU/Linux 10.2.0 _Buster_ - Unofficial amd64 DVD Binary-1 with firmware 20191116-09:57]/ buster contrib main non-free

#deb cdrom:[Debian GNU/Linux 10.2.0 _Buster_ - Unofficial amd64 DVD Binary-1 with firmware 20191116-09:57]/ buster contrib main non-free

deb http://deb.debian.org/debian/ buster main non-free contrib
# deb-src http://deb.debian.org/debian/ buster main non-free contrib

deb http://security.debian.org/debian-security buster/updates main contrib non-free
# deb-src http://security.debian.org/debian-security buster/updates main contrib non-free

# buster-updates, previously known as 'volatile'
deb http://deb.debian.org/debian/ buster-updates main contrib non-free
# deb-src http://deb.debian.org/debian/ buster-updates main contrib non-free

# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.

Any help on what's wrong?

[Head_on_a_Stick]

Please post the output of

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ls -l /etc/resolv.conf
cat /etc/resolv.conf
ping -c3 -4 security.debian.org
ping -c3 -4 151.101.128.204

[morse_the_horse]

Please post the output of

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ls -l /etc/resolv.conf
cat /etc/resolv.conf
ping -c3 -4 security.debian.org
ping -c3 -4 151.101.128.204

The pings work fine.

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ls -l /etc/resolv.conf
-rw-r--r-- 1 root root 354 Apr 10 09:22 /etc/resolv.conf
cat /etc/resolv.conf
# resolv.conf(5) file generated byTorGuard
nameserver 10.9.0.1
nameserver 10.8.0.1

Note I did say

I can http to the security.debian.org with browser without problem.

[Head_on_a_Stick]

So does APT work without the VPN? And why didn't you tell us you're using that?

[morse_the_horse]

So does APT work without the VPN? And why didn't you tell us you're using that?

Sorry. I turn the VPN at startup. I'll have to wait until I have more updates to see if there is a difference.

[cuckooflew]

Which way do you turn the VPN at startup, ? off or on ? And I also wonder why the OP did not mention that ?

[arzgi]

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Unable to download updates:
failed to refresh cache: E: http://security.debian.org/debian-security buster/updates InRelease is not (yet) available (Could not resolve 'security.debian.org')

I got the same error when my mobo's battery had died, and clock stopped.

[stevepusser]

BTW, "someone or something" touched your sources.list to add the contrib and nonfree sections, as well as comment out the deb-src lines. There's nothing wrong with that at all, but that's not what Debian installs by default.

[sunrat]

BTW, "someone or something" touched your sources.list to add the contrib and nonfree sections, as well as comment out the deb-src lines. There's nothing wrong with that at all, but that's not what Debian installs by default.

I did a fresh netinstall of Buster a couple of weeks ago and IIRC the installer asks if you want contrib/nonfree in sources.

[arzgi]

I did a fresh netinstall of Buster a couple of weeks ago and IIRC the installer asks if you want contrib/nonfree in sources.

I can confirm that, also it asks if you want source files, even backports.