Apache2 wont start after installation

I have the lastest Version of OSMC on my RPi3. The Webinterface from Kodi runs on Port 8080. If I install apache2 it wont start and /etc/init.d/apache2 status gives out this:

    root@pi:/# /etc/init.d/apache2 status
* apache2.service - LSB: Apache2 web server
   Loaded: loaded (/etc/init.d/apache2)
  Drop-In: /lib/systemd/system/apache2.service.d
   Active: failed (Result: exit-code) since Sat 2017-09-09 11:32:26 CEST; 7min ago
  Process: 29536 ExecStart=/etc/init.d/apache2 start (code=exited, status=1/FAILURE)

Sep 09 11:32:26 pi apache2[29536]: Starting web server: apache2 failed!
Sep 09 11:32:26 pi apache2[29536]: The apache2 instance did not start within 20 seconds. Please read the log 
files to discover problems ... (warning).
Sep 09 11:32:26 pi systemd[1]: apache2.service: control process exited, code=exited status=1
Sep 09 11:32:26 pi systemd[1]: Failed to start LSB: Apache2 web server.
Sep 09 11:32:26 pi systemd[1]: Unit apache2.service entered failed state.

I found this: Apache2 faild every time - Raspberry Pi Forums
Looks like the same issue and with osmc too. But there isnt a solution. But maybe that can help you to support me.
Thanks for your help.

Kodi webserver runs on 80 by default.
Double check that, otherwise check Apache error log. That will show you what the problem is

Error file is empty and the Kodi Webserver runs on Port 8080

Try run the apache2 binary directly and you will soon see the problem