clonezilla: 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/sbin/clonezilla - from package: clonezilla

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