Ubuntu old repository add Rumi, November 21, 2018 If you want to continue using an outdated release then edit /etc/apt/sources.list and change archive.ubuntu.com and security.ubuntu.com to old-releases.ubuntu.com. You can do this with sed: sudo sed -i -re 's/([a-z]{2}\.)?archive.ubuntu.com|security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list then update with: sudo apt-get update && sudo apt-get dist-upgrade Sometimes, it might be faster to create backups of your system and reinstall using supported release instead. Administrations Configurations (Linux) Ubuntu