xenstored: 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/lib/xen-4.4/bin/xenstored - from package: xen-utils-4.4

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

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