dictconv: 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/bin/dictconv - from package: dictconv

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