If, when setting up Linux iPXE, the DHCP service does not start and gives the error:

O isc-dhcp-server.service - ISC DHCP IPv4 server

     Loaded: loaded (/lib/systemd/system/isc-dhcp-server.service; enabled; vendor preset: enabled)

     Active: failed (Result: exit-code) since Wed 2021-06-16 14:53:05 CEST; 59min ago

       Docs: man:dhcpd(8)

    Process: 1637 ExecStart=/bin/sh -ec      CONFIG_FILE=/etc/dhcp/dhcpd.conf;      if [ -f /etc/ltsp/dhcpd.conf ]; then CONFIG_FILE=/etc/ltsp/dhcpd.conf; fi;>

   Main PID: 1637 (code=exited, status=1/FAILURE)

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: 
jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: If you think you have received this message due to a bug rather

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: than a configuration issue please read the section on submitting

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: bugs on either our web page at www.isc.org or in the README file

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: before submitting a bug.  These pages explain the proper

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: process and the information we find helpful for debugging.

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: 

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: exiting.

jun 16 14:53:05 wd-Latitude-E6530 systemd[1]: isc-dhcp-server.service: Main process exited, code=exited, status=1/FAILURE

jun 16 14:53:05 wd-Latitude-E6530 systemd[1]: isc-dhcp-server.service: Failed with result 'exit-code'.

Main error line: isc-dhcp-server.service: Failed with result 'exit-code'. 

The service must be restarted. The normal one; $ sudo systemctl restart isc-dhcp-server might not work, therefor we reccomand this one: $ sudo systemctl restart isc-dhcp-server.service

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