서비스 시작 시 시간 초과가 발생하지만 수동으로 시작할 수 있습니다. 무엇이 문제일까요?

최근에 apche2와 php7.1-fpm을 설치하고 시작에 추가했습니다.

systemctl enable apache2
systemctl enable php7.1-fpm

시스템을 다시 시작하면 systemctl status가 다음과 같이 표시됩니다.

sudo systemctl  status apache2.service php7.1-fpm.service

● apache2.service - The Apache HTTP Server
 Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor 
preset: enabled)
 Active: failed (Result: timeout) since Mon 2017-12-25 18:53:43 CET; 
  10min ago
  Process: 468 ExecStart=/usr/sbin/apachectl start (code=killed, 
signal=TERM)

Dez 25 18:53:33 drupal-PC systemd[1]: Starting The Apache HTTP 
Server...
Dez 25 18:53:43 drupal-PC apachectl[468]: AH00558: apache2: Could not 
reliably determine the server's fully qualified do
Dez 25 18:53:43 drupal-PC systemd[1]: apache2.service: Start operation 
timed out. Terminating.
Dez 25 18:53:43 drupal-PC systemd[1]: Failed to start The Apache HTTP 
Server.
Dez 25 18:53:43 drupal-PC systemd[1]: apache2.service: Unit entered 
failed state.
Dez 25 18:53:43 drupal-PC systemd[1]: apache2.service: Failed with 
result 'timeout'.

● php7.1-fpm.service - The PHP 7.1 FastCGI Process Manager
 Loaded: loaded (/lib/systemd/system/php7.1-fpm.service; enabled; 
 vendor preset: enabled)
  Active: failed (Result: timeout) since Mon 2017-12-25 18:53:43 CET; 
  10min ago
    Docs: man:php-fpm7.1(8)
   Process: 463 ExecStart=/usr/sbin/php-fpm7.1 --nodaemonize --fpm-
 config /etc/php/7.1/fpm/php-fpm.conf (code=killed, sig
 Main PID: 463 (code=killed, signal=TERM)

 Dez 25 18:53:33 drupal-PC systemd[1]: Starting The PHP 7.1 FastCGI 
 Process Manager...
 Dez 25 18:53:43 drupal-PC systemd[1]: php7.1-fpm.service: Start 
 operation timed out. Terminating.
Dez 25 18:53:43 drupal-PC systemd[1]: Failed to start The PHP 7.1 
FastCGI Process Manager.
Dez 25 18:53:43 drupal-PC systemd[1]: php7.1-fpm.service: Unit entered 
failed state.
Dez 25 18:53:43 drupal-PC systemd[1]: php7.1-fpm.service: Failed with 
result 'timeout'.

서비스를 수동으로 시작하면 모든 것이 잘 작동합니다. 문제는 어디에 있습니까?