xpstops: 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/xpstops - from package: libgxps-utils

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

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