Steps to reproduce:

1. apt install zabbix-server-pgsql zabbix-frontend-php php7.0-pgsql zabbix-agent
2. # sudo -u postgres createuser --pwprompt zabbix
3. sudo -u postgres createdb -O zabbix zabbix
4. # zcat /usr/share/doc/zabbix-server-pgsql*/create.sql.gz | sudo -u zabbix psql zabbix
5. Edit file /etc/zabbix/apache.conf, uncomment and set the right timezone for you.
   # php_value date.timezone Europe/Riga
6. # systemctl restart zabbix-server zabbix-agent apache2
7. # systemctl enable zabbix-server zabbix-agent apache2{{}}

Result:
http://127.0.0.1/zabbix

Not Found

HTTP Error 404. The requested resource is not found.

Expected:
Connect to your newly installed Zabbix frontend: http://server_ip_or_name/zabbix