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I use Ubuntu 20.04 and firewall won't work on my device. I get this message when trying to start firewall with systemctl start firewall: root@agent:/usr/bin# systemctl start firewall Job for firewall.
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May 20, 2020 Ubuntu PC operating system | Ubuntu With a built-in firewall and virus protection software, Ubuntu is one of the most secure operating systems around. And the long-term support releases give you five years of security patches and updates. 5 Best Free Linux / Ubuntu Firewalls | Firewalls For Linux