orphaner: 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/orphaner - from package: deborphan

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

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