xc_save: 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/xc_save - from package: xen-utils-4.4

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

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