gnome-btdownload: 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/gnome-btdownload - from package: gnome-btdownload

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

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