xenconsole: command not found

Have You tried accessing the binary with the full path?

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/xenconsole - from package: xen-utils-4.4

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