prep-ocsroot: 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/sbin/prep-ocsroot - from package: clonezilla

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

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