nodeusers: 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/nodeusers - from package: ax25-node

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

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