cdvupgrade: 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/bin/cdvupgrade - from package: codeville

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

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