deluge: 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/deluge - from package: deluge

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

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