btcompletedirgui.bittornado: 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/btcompletedirgui.bittornado - from package: bittornado-gui

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