xfhdlcchpar: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/sbin/xfhdlcchpar - from package: ax25-xtools

You may install the required package with command apt-get install {package}
Error in other languages:
xfhdlcchpar: bevel nie gevind nie
xfhdlcchpar: comandă negăsită
xfhdlcchpar: comando não encontrado
xfhdlcchpar: commande introuvable
xfhdlcchpar: command not found
xfhdlcchpar: käsku ei ole
xfhdlcchpar: không tìm thấy lệnh
xfhdlcchpar: komanda nerasta
xfhdlcchpar: Kommando nicht gefunden.
xfhdlcchpar: kommandot finns inte
xfhdlcchpar: komut yok
xfhdlcchpar: nie znaleziono polecenia
xfhdlcchpar: níor aimsíodh an t-ordú
xfhdlcchpar: no se encontró la orden
xfhdlcchpar: no s'ha trobat l'ordre
xfhdlcchpar: opdracht niet gevonden
xfhdlcchpar: parancs nem található
xfhdlcchpar: perintah tidak ditemukan
xfhdlcchpar: príkaz nenájdený
xfhdlcchpar: příkaz nenalezen
xfhdlcchpar: команда не найдена
xfhdlcchpar: командата не е открита
xfhdlcchpar: 命令找不到
xfhdlcchpar: コマンドが見つかりません