[Koha] Error while starting apache2 in Ubuntu 16.04

[Dp Tripathi]

Dear all,

I am getting the following error while starting the apache2 in Ubuntu-16.04.

Job for apache2.service failed because the control process exited with
error code. See "systemctl status apache2.service" and "journalctl -xe" for
details.

​Kindly help

With regards,
DP Tripathi
NIT Rourkela​