startupmanager: 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/sbin/startupmanager - from package: startupmanager

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

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