Same problem after backup restoration on a fresh install.
Below fixed my issue:
fwconsole ma disable extensionroutes
fwconsole ma remove firewall sysadmin
fwconsole reload
fwconsole ma downloadinstall sysadmin firewall
fwconsole ma enable extensionroutes
fwconsole reload
/var/www/html/admin/modules/sysadmin/hooks/fail2ban-apache-config
service fail2ban start
Obviously I’ve lost my firewall configuration but not a big deal for me, what matters is that it works again. Hope it helps you too.