This is where I will keep Compiled Deb's + init.d scripts in zips + install links. If you want you can Compile Deb Yourself.
sudo su
apt-get update apt-get install -y wget unzip cd ~ rm xymon-client*.deb wget https://www.freesoftwareservers.com/wiki/files/3965361/10649781/1/1485784808484/XYMon_Client_4.3.27.zip unzip XYMon*.zip cd XYMon-Client*
sudo cp xymon-client /etc/init.d/ sudo chmod a+x /etc/init.d/xymon-client sudo update-rc.d xymon-client defaults
Install Client :
dpkg -i xymon-client*deb
sudo sed -i 's/\(^XYMSRV=\).*/\XYMSRV="192.168.1.255"/' /etc/xymon/xymonclient.cfg
sudo sed -i 's/\(^CLIENTHOSTNAME=\).*/\CLIENTHOSTNAME="HOSTNAME4-HOSTS.CFG"/' /etc/default/xymon-client
sudo service xymon-client restart