spindown: 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/lib/plainbox-providers-1/checkbox/bin/spindown - from package: plainbox-provider-checkbox

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

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