You just installed LAMP on your Fedora and needs to restart iptables then this error message is always displayed.
[root@localhost enyamador]# systemctl restart iptables.service Failed to issue method call: Unit iptables.service failed to load: No such file or directory.
Open Terminal and install:
# yum install iptables-services
Re-run command to restart iptables and it should pass successfully.
[root@localhost enyamador]# systemctl restart iptables.service [root@localhost enyamador]#
Hope it helps you.