RTFM && WTFN - backup

apt update 
apt install openssh-server
systemctl start ssh
systemctl enable ssh

Если на этапе установки не дать ОС выход в интернет, то в списке репо будет только “cdrom:”.
После настройки ip-адреса не получится сделать “apt update”.

В “/etc/apt/sources.list” комментируем “deb cdrom:[De..” и раскомментируем и дописываем “deb http://deb.debian.org/debian/ bullseye main contrib non-free”
Приводим файл к виду:

root@swan1:~# cat /etc/apt/sources.list
# deb cdrom:[Debian GNU/Linux 11.7.0 _Bullseye_ - Official amd64 NETINST 20230429-11:49]/ bullseye main

#deb cdrom:[Debian GNU/Linux 11.7.0 _Bullseye_ - Official amd64 NETINST 20230429-11:49]/ bullseye main

# Line commented out by installer because it failed to verify:
deb http://security.debian.org/debian-security bullseye-security main
# Line commented out by installer because it failed to verify:
deb-src http://security.debian.org/debian-security bullseye-security main

# bullseye-updates, to get updates before a point release is made;
# see https://www.debian.org/doc/manuals/debian-reference/ch02.en.html#_updates_and_backports
# 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/ bullseye main contrib non-free
#deb-src http://deb.debian.org/debian/ bullseye-updates main

Поднимаем интерфейс.

# ip -c link show 
# ip link set dev ens18 up

Задаем ip-адрес и маршрут по умолчанию.

# ip addr add x.x.x.x/24  dev ens18
# ip route add 0.0.0.0/0 via x.x.x.1

DNS.

# echo 'nameserver 8.8.8.8' > /etc/resolv.conf