インストールはapt一発。（Ubuntu Serverの場合）

$ sudo apt install isc-dhcp-server

設定ファイル等は/etc/dhcp以下に収められている。（Ubuntu 22.04.1 LTSで確認）

/etc/dhcp/dhcpd.conf

kimi@sstw:/etc/dhcp$ cat dhcpd.conf
# dhcpd.conf
 
# option definitions common to all supported networks...
option domain-name "***********";
option domain-name-servers 192.168.10.AAA, 192.168.10.BBB;
 
default-lease-time 600;
max-lease-time 7200;
 
subnet 192.168.10.0 netmask 255.255.255.0 {
   range 192.168.10.XXX 192.168.10.YYY;
#  option domain-name-servers ns1.internal.example.org;
#  option domain-name "internal.example.org";
#  option subnet-mask 255.255.255.224;
   option routers 192.168.10.ZZZ;
#  option broadcast-address 10.5.5.31;
#  default-lease-time 600;
#  max-lease-time 7200;
}

サーバの起動

$ sudo systemctl start isc-dhcp-server
$ sudo systemctl status isc-dhcp-server