DHCP config fails during install

[ashahn1]

Describe the bug
The bug is identical to this one: #593

During install the DHCP configuration script fails to correctly set the IP ranges.

To Reproduce
Steps to reproduce the behavior:

1. Install FOG on Ubuntu Server 24.04 LTS as described in https://docs.fogproject.org/en/latest/installation/server/install-fog-server/#installer-prompts

Software (please complete the following information):

• FOG version 1.5.10.1629
• OS: Ubuntu Server 24.04 LTS

Additional context

The problem is located in the functions script (/fogproject/lib/common/functions.sh) at line 255. The command ip -4 addr show | grep -w inet | grep $interface | awk '{print $4}' returns "global" when run on ubuntu. When fed into the function "subtract1fromAddress" this will return an "Invalid IP Passed" error which is in turn pasted into the dhcpd.conf file and causes the dhcp service to fail due to misconfiguration.

My solution was to replace line 255 in /fogproject/lib/common/functions.sh with the following:

echo $(ip -4 addr show | grep -w inet | grep eno2 | awk '{print $2}' | sed 's/...$//')

I can't say if this works for other distro's or versions of Ubuntu but this fixed the issue with Ubuntu Server 24.04 LTS.