user-setup: 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/bin/user-setup - from package: user-setup

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

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