deluge-web: 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-web - from package: deluge-web

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

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