- Linux Security: https://linuxsecurity.com/
- The official VirtualBox website: https://www.virtualbox.org/
- The Ubuntu "Alternate Installer" download page: https://ubuntu.com/download/alternative-downloads#alternate-ubuntu-server-installer
- The official CentOS page: https://www.centos.org/
- RHEL documentation (this also works for CentOS): https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/
- How to Set Up Automatic Updates on Ubuntu Server 18.04: https://libre-software.net/ubuntu-automatic-updates/
- Enabling Automatic Updates in RHEL 7 and CentOS 7: https://linuxaria.com/howto/enabling-automatic-updates-in-centos-7-and-rhel-7
- Managing and Monitoring Security Updates for RHEL 8: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/managing_and_monitoring_security_updates/index
United States
Great Britain
India
Germany
France
Canada
Russia
Spain
Brazil
Australia
Singapore
Hungary
Philippines
Mexico
Thailand
Ukraine
Luxembourg
Estonia
Lithuania
Norway
Chile
South Korea
Ecuador
Colombia
Taiwan
Switzerland
Indonesia
Cyprus
Denmark
Finland
Poland
Malta
Czechia
New Zealand
Austria
Turkey
Sweden
Italy
Egypt
Belgium
Portugal
Slovenia
Ireland
Romania
Greece
Argentina
Malaysia
South Africa
Netherlands
Bulgaria
Latvia
Japan
Slovakia