NetSUSLP broke my ISC-DHCP-Server's service

[tomhsiung]

Hello, guys

My ISC-DHCP-server had been working very well until I installed NetSUSLP 2 days ago. After the installation of NetSUSLP via the run package, my DHCP service provided by ISC-DHCP-Server failed to work.

sudo systemctl status isc-dhcp-server
● isc-dhcp-server.service - ISC DHCP IPv4 server
   Loaded: loaded (/lib/systemd/system/isc-dhcp-server.service; enabled; vendor 
   Active: failed (Result: exit-code) since Fri 2019-10-04 05:09:22 UTC; 17s ago
     Docs: man:dhcpd(8)
  Process: 10255 ExecStart=/bin/sh -ec      CONFIG_FILE=/etc/dhcp/dhcpd.conf;   
 Main PID: 10255 (code=exited, status=1/FAILURE)

Oct 04 05:09:22 server dhcpd[10255]: If you intend to request help from the dhcp
Oct 04 05:09:22 server dhcpd[10255]: mailing list, please read the section on th
Oct 04 05:09:22 server dhcpd[10255]: submitting bug reports and requests for hel
Oct 04 05:09:22 server dhcpd[10255]: 
Oct 04 05:09:22 server dhcpd[10255]: Please do not under any circumstances send 
Oct 04 05:09:22 server dhcpd[10255]: help directly to the authors of this softwa
Oct 04 05:09:22 server dhcpd[10255]: send them to the appropriate mailing list a
Oct 04 05:09:22 server dhcpd[10255]: the README file.
Oct 04 05:09:22 server dhcpd[10255]: 
Oct 04 05:09:22 server dhcpd[10255]: exiting.

Here is the brief installation log of NetSUSLP

sudo ./NetSUSLPInstaller_5.0.1.run
Verifying archive integrity... All good.
Uncompressing NetSUSLP Installer..............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Starting the NetSUS Installation
Checking installation requirements...
Checking for a 64-bit OS...OK
Checking for a supported OS...Ubuntu 18.04.2 LTS found
Warning: Ubuntu 18.04 support is currently experimental, proceed with caution.
Checking for required Ubuntu binaries...OK
Passed all requirements

The following will be installed
* Appliance Web Interface
* File Sharing
* Software Update Server
* NetBoot Server
* LDAP Proxy

Proceed?  (y/n): y
Installing...
Starting Web Application Installation
Restarting apache...
OK
Finished deploying the appliance web application
Starting NetBoot Installation
OK
Finished deploying NetBoot
Starting SUS Installation
OK
Finished deploying SUS
Starting LDAP Proxy Installation
OK
Finished deploying the LDAP Proxy

The NetSUSLP has been installed.
Verify that port 443 and 80 are not blocked by a firewall.

Note: IP Helpers are required if using NetBoot across subnets.
The NetBoot folder name can not contain any spaces

To complete the installation, open a web browser and navigate to https://server:443/.
If you are installing NetSUSLP for the first time, please follow the documentation for setup instructions.