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 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.