cconv: 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/cconv - from package: cconv

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

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