kissnetd: command not found

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

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

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/kissnetd - from package: ax25-tools

You may install the required package with command apt-get install {package}

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