I have installed apache2 on ubuntu 16.00 and checked the logs and no errors
apt list --installed | grep apache2
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
apache2/xenial-updates,xenial-security,now 2.4.18-2ubuntu3.5 amd64 [installed]
apache2-bin/xenial-updates,xenial-security,now 2.4.18-2ubuntu3.5 amd64 [installed,automatic]
apache2-data/xenial-updates,xenial-updates,xenial-security,xenial-security,now 2.4.18-2ubuntu3.5 all [installed,automatic]
apache2-utils/xenial-updates,xenial-security,now 2.4.18-2ubuntu3.5 amd64 [installed,automatic]
journalctl -u apache2
-- Logs begin at Thu 2017-12-07 11:47:37 GMT, end at Thu 2017-12-07 17:05:11 GMT
Dec 07 11:47:38 icinga-new systemd[1]: Starting LSB: Apache2 web server...
Dec 07 11:47:38 icinga-new apache2[1253]: * Starting Apache httpd web server ap
Dec 07 11:47:39 icinga-new apache2[1253]: *
Dec 07 11:47:39 icinga-new systemd[1]: Started LSB: Apache2 web server.
Dec 07 15:05:19 icinga-new systemd[1]: Stopping LSB: Apache2 web server...
Dec 07 15:05:19 icinga-new apache2[3657]: * Stopping Apache httpd web server ap
Dec 07 15:05:20 icinga-new apache2[3657]: *
Dec 07 15:05:20 icinga-new systemd[1]: Stopped LSB: Apache2 web server.
Dec 07 16:04:08 icinga-new systemd[1]: Starting LSB: Apache2 web server...
Dec 07 16:04:08 icinga-new apache2[5407]: * Starting Apache httpd web server ap
Dec 07 16:04:09 icinga-new apache2[5407]: *
Dec 07 16:04:09 icinga-new systemd[1]: Started LSB: Apache2 web server.
Dec 07 16:44:48 icinga-new systemd[1]: Stopping LSB: Apache2 web server...
Dec 07 16:44:48 icinga-new apache2[20314]: * Stopping Apache httpd web server a
Dec 07 16:44:49 icinga-new apache2[20314]: *
Dec 07 16:44:49 icinga-new systemd[1]: Stopped LSB: Apache2 web server.
Dec 07 16:44:49 icinga-new systemd[1]: Starting LSB: Apache2 web server...
Dec 07 16:44:49 icinga-new apache2[20338]: * Starting Apache httpd web server a
Dec 07 16:44:50 icinga-new apache2[20338]: *
Dec 07 16:44:50 icinga-new systemd[1]: Started LSB: Apache2 web server.
Dec 07 16:44:50 icinga-new systemd[1]: Reloading LSB: Apache2 web server.
Dec 07 16:44:50 icinga-new apache2[20420]: * Reloading Apache httpd web server
Dec 07 16:44:50 icinga-new apache2[20420]: *
---------- Post updated at 01:13 PM ---------- Previous update was at 01:08 PM ----------
[Thu Dec 07 11:47:38.996045 2017] [mpm_prefork:notice] [pid 1347] AH00163: Apach
e/2.4.18 (Ubuntu) configured -- resuming normal operations
[Thu Dec 07 11:47:38.996544 2017] [core:notice] [pid 1347] AH00094: Command line
: '/usr/sbin/apache2'
[Thu Dec 07 15:05:19.992732 2017] [mpm_prefork:notice] [pid 1347] AH00169: caugh
t SIGTERM, shutting down
[Thu Dec 07 16:04:08.370660 2017] [mpm_prefork:notice] [pid 5425] AH00163: Apach
e/2.4.18 (Ubuntu) configured -- resuming normal operations
[Thu Dec 07 16:04:08.370716 2017] [core:notice] [pid 5425] AH00094: Command line
: '/usr/sbin/apache2'
[Thu Dec 07 16:44:48.635402 2017] [mpm_prefork:notice] [pid 5425] AH00169: caugh
t SIGTERM, shutting down
[Thu Dec 07 16:44:49.685624 2017] [mpm_prefork:notice] [pid 20356] AH00163: Apac
he/2.4.18 (Ubuntu) configured -- resuming normal operations
[Thu Dec 07 16:44:49.685675 2017] [core:notice] [pid 20356] AH00094: Command lin
e: '/usr/sbin/apache2'
[Thu Dec 07 16:44:50.908824 2017] [mpm_prefork:notice] [pid 20356] AH00171: Grac
eful restart requested, doing restart
[Thu Dec 07 16:44:50.911178 2017] [mpm_prefork:notice] [pid 20356] AH00163: Apac
he/2.4.18 (Ubuntu) configured -- resuming normal operations
[Thu Dec 07 16:44:50.911183 2017] [core:notice] [pid 20356] AH00094: Command lin
e: '/usr/sbin/apache2'
[Thu Dec 07 16:52:43.741223 2017] [mpm_prefork:notice] [pid 20356] AH00169: caug
ht SIGTERM, shutting down
[Thu Dec 07 16:52:54.984472 2017] [mpm_prefork:notice] [pid 21295] AH00163: Apac
he/2.4.18 (Ubuntu) configured -- resuming normal operations
[Thu Dec 07 16:52:54.984530 2017] [core:notice] [pid 21295] AH00094: Command lin
e: '/usr/sbin/apache2'
[Thu Dec 07 17:04:49.282153 2017] [mpm_prefork:notice] [pid 21295] AH00169: caug
ht SIGTERM, shutting down
[Thu Dec 07 17:04:50.333958 2017] [mpm_prefork:notice] [pid 21377] AH00163: Apac
he/2.4.18 (Ubuntu) configured -- resuming normal operations
[Thu Dec 07 17:04:50.334008 2017] [core:notice] [pid 21377] AH00094: Command lin
e: '/usr/sbin/apache2'
[Thu Dec 07 17:05:09.430777 2017] [mpm_prefork:notice] [pid 21377] AH00169: caug
ht SIGTERM, shutting down
[Thu Dec 07 17:05:10.479046 2017] [mpm_prefork:notice] [pid 21443] AH00163: Apac
he/2.4.18 (Ubuntu) configured -- resuming normal operations
[Thu Dec 07 17:05:10.479094 2017] [core:notice] [pid 21443] AH00094: Command lin
e: '/usr/sbin/apache2'