GNU nano 3.2 /etc/apt/sources.list
#
# deb cdrom:[Debian GNU/Linux 10.5.0 _Buster_ - Official i386 DVD Binary-1 20200801-13:12]/ buster contrib main
deb [trusted=yes] cdrom:[Debian GNU/Linux 10.5.0 _Buster_ - Official i386 DVD Binary-2 20200801-13:12]/ buster $
#deb [trusted=yes] cdrom:[Debian GNU/Linux 10.5.0 _Buster_ - Official i386 DVD Binary-1 20200801-13:12]/ buster$
#deb
http://security.debian.org/debian-security buster/updates main contrib
#deb-src
http://security.debian.org/debian-security buster/updates main contrib
# buster-updates, previously known as 'volatile'
# A network mirror was not selected during install. The following entries
# are provided as examples, but you should amend them as appropriate
# for your mirror of choice.
#
# deb
http://deb.debian.org/debian/ buster-updates main contrib
# deb-src
http://deb.debian.org/debian/ buster-updates main contrib