Установить webmin на Linux Mint 18.3

1. Добавить репозиторий
~ # nano /etc/apt/sources.list
deb http://download.webmin.com/download/repository sarge contrib
deb http://webmin.mirror.somersettechsolutions.co.uk/repository sarge contrib

2. Скачать ключ
~ # wget http://www.webmin.com/jcameron-key.asc

3. Установить ключ
~ # apt-key add jcameron-key.asc

4. Обновить:
~ # apt-get update
5. Установить webmin
~ # apt-get install webmin

Готово:
https://IP:10000/

ОБНОВЛЕНИЯ LINUX MINT 18.2 SONYA на 18.3 sylvia

Файл: /etc/apt/sources.list.d/official-package-repositories.list

deb http://packages.linuxmint.com sylvia main upstream import backport

deb http://archive.ubuntu.com/ubuntu xenial main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu/ xenial partne

После:
apt update
apt upgrade
apt full-upgrade

Перезагружаем устройство:
sudo reboot